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Software Engineering Pairing Work 02 The Development of Software Engineering The Concept of Software Engineering The Definition of Software Engineering
Backend Development
PHP Tutorial
Software Engineering Pairing Work 02 The Development of Software Engineering The Concept of Software Engineering The Definition of Software Engineering
Software Engineering Pairing Work 02 The Development of Software Engineering The Concept of Software Engineering The Definition of Software Engineering
software engineering
1. Design idea:
The main functions I implemented in this task using php must have addition and subtraction by default.
First, create the index.php file and create a form in the HTML statement. The form content includes the number of questions, the maximum and minimum values, and some other options.
Then, create the rubric.php file, submit the form information to this file, and call the passed values when implementing the four arithmetic operations methods. The method of implementing the four arithmetic operations is similar to the method used when using Java several times before. The code has been modified and optimized. Put the questions and answers into the question.txt and answer.txt files respectively for future use.
Third, create submitAnswer.php, acceptAnswer.php, deleteAnswer.php and judgeAnswer.php files for submitting answers online, receiving answers, and deleting them respectively. Answers and Determine Answers. The submitted answers are placed in the answer1.txt file. When judging the answer, just compare the contents in the answer.txt and answer1.txt files.
2. Source code
<span> 1</span> index.<span>php
</span><span> 2</span>
<span> 3</span> <!--
<span> 4</span> start <span>date</span> 2016/3/28
<span> 5</span> completion <span>date</span> 2016/4/7
<span> 6</span><span>author Jing
</span><span> 7</span><span>this program is about four arithmetic operations
</span><span> 8</span> -->
<span> 9</span>
<span> 10</span>
<span> 11</span> <meta charset="UTF-8">
<span> 12</span> <title>Four arithmetic calculation system</title>
<span> 13</span> <script>
<span> 14<span>function<span> check() {
<span> 15<span>var tt=/^(0|[1-9]d*)$/<span>;
<span> 16<span>if(!tt.test(form1.<span>min.<span>value))
<span> 17<span> {
<span> 18 alert('The minimum value input is illegal'<span>);
<span> 19 form1.<span>min.<span>focus();
<span> 20<span>return<span>false<span>;
<span> 21<span> }
<span> 22<span>if(!tt.test(form1.<span>max.value) || (form1.<span>max.value<form1.<span>min.<span>value))
<span> 23<span> {
<span> 24 alert('The maximum value input is illegal'<span>);
<span> 25 form1.<span>min.<span>focus();
<span> 26<span>return<span>false<span>;
<span> 27<span> }
<span> 28<span>if(!tt.test(form1.num.value) || (form1.num.value==0<span>))
<span> 29<span> {
<span> 30 alert('The number of questions entered is illegal'<span>);
<span> 31 form1.num.<span>focus();
<span> 32<span>return<span>false<span>;
<span> 33<span> }
<span> 34<span>return<span>true<span>;
<span> 35<span> }<span> 36 </script>
<span> 37</span>
<span> 38</span>
<span> 39</span> <button type="button">Login</button> <button type="button">Register</button>
<span> 40</span> <br><br>
<span> 41</span> <center>
<span> 42</span> <font color="red" size="7" face="毷体">Welcome to the primary school four arithmetic operation question system</font> <br><br>< ;br/>
<span> 43</span><span> 44</span> <form action="rubric.php" target="_blank" method="post" name="form1">
<span> 45</span> <font color="red" size="5">By default, only two numbers participate in addition and subtraction</font> <br><br>
<span> 46</span><span> 47</span> <font color="blue" size="4">Please enter the minimum value (non-negative integer) involved in the operation</font>
<span> 48</span> <input type="text" name="min"> <br><br>
<span> 49</span><span> 50</span> <font color="blue" size="4">Please enter the maximum value to participate in the operation (non-negative integer and not less than the minimum value)</font>
<span> 51</span> <input type="text" name="max"> <br><br>
<span> 52</span><span> 53</span> <font color="blue" size="4">Please enter the number of questions (positive integer)</font>
<span> 54</span> <input type="text" name="num"> <br><br>
<span> 55</span><span> 56</span> <font color="blue" size="4">Select the number of numbers to participate in the operation</font>
<span> 57</span> <input type="radio" value="2" name="num1" checked>2
<span> 58</span> <input type="radio" value="3" name="num1">3
<span> 59</span> <input type="radio" value="4" name="num1">4 <br><br><!--1 digit in num1 1 2 3 1, not l m n's l-->
<span> 60</span><span> 61</span> <font color="blue" size="4">Choose whether to add multiplication</font>
<span> 62</span> <input type="radio" value="t" name="mul"><span>Yes
</span><span> 63</span> <input type="radio" value="f" name="mul" checked>No <br><br>
<span> 64</span><span> 65</span> <font color="blue" size="4">Choose whether to add division</font>
<span> 66</span> <input type="radio" value="t" name="div"><span>Yes
</span><span> 67</span> <input type="radio" value="f" name="div" checked>No <br><br>
<span> 68</span><span> 69</span> <input type="submit" value="Confirm" name="send">
<span> 70</span> <input type="reset" value="Reset" name="send">
<span> 71</span> </form>
<span> 72</span> </center>
<span> 73</span>
<span> 74</span>
<span> 75</span><span> 76</span> rubric.<span>php
</span><span> 77</span><span> 78</span>
<span> 79</span>
<span> 80</span> <meta charset="UTF-8">
<span> 81</span> <title>Question setting interface</title>
<span> 82</span>
<span> 83</span>
<span> 84</span><span> 85</span> <span>php
</span><span> 86</span><span>if</span>(<span>is_numeric</span>(<span>$_POST</span>["max"<span>]))
</span><span> 87</span><span> {
</span><span> 88</span><span>$max</span>=<span>$_POST</span>["max"]; <span>//</span><span>maximum value</span><span> 89</span><span> }
</span><span> 90</span><span>if</span>(<span>is_numeric</span>(<span>$_POST</span>["min"<span>]))
</span><span> 91</span><span> {
</span><span> 92</span><span>$min</span>=<span>$_POST</span>["min"]; <span>//</span><span>minimum value</span><span> 93</span><span> }
</span><span> 94</span><span>if</span>(<span>is_numeric</span>(<span>$_POST</span>["num"<span>]))
</span><span> 95</span><span> {
</span><span> 96</span><span>$num</span>=<span>$_POST</span>["num"]; <span>//</span><span>Number of questions</span><span> 97</span><span> }
</span><span> 98</span><span>if</span>(<span>is_numeric</span>(<span>$_POST</span>["num1"<span>]))
</span><span> 99</span><span> {
</span><span>100</span><span>$num1</span>=<span>$_POST</span>["num1"]; <span>//</span><span>Number of items participating in the operation</span><span>101</span><span> }</span><span>102</span><span>if</span>(<span>is_string</span>(<span>$_POST</span>["mul"<span>]))
</span><span>103</span><span> {
</span><span>104</span><span>$mul</span>=<span>$_POST</span>["mul"]; <span>//</span><span>Choose whether to add multiplication Yes t No f</span><span>105</span><span> }
</span><span>106</span><span>if</span>(<span>is_string</span>(<span>$_POST</span>["div"<span>]))
</span><span>107</span><span> {
</span><span>108</span><span>$div</span>=<span>$_POST</span>["div"]; <span>//</span><span>Choose whether to add division Yes or no f</span><span>109</span><span> }
</span><span>110</span><span>111</span><span>/*</span><span> Define array </span><span>*/</span><span>112</span><span>$a</span>=<span>array</span>(); <span>//</span><span> used in the method to store random numbers and operators</span> <span> 113</span><span>$amd</span>=<span>array</span>(); Used in the <span>//</span><span> method to store the multiplication/division calculations into this array</span><span>114</span><span>$b</span>=<span>array</span>(); <span>//</span><span>Use </span><span>115</span><span>$d</span>=<span>array</span>(); <span>//</span><span>to store questions</span><span>116</span><span>$e</span>=<span>array</span>(); <span>// </span> <span>Storing answers</span><span>117</span><span>118</span><span>/*</span><span> The Result class is used to encapsulate the results</span><span>*/</span><span>119</span><span>class</span><span> Result
</span><span>120</span><span> {
</span><span>121</span><span>public</span><span>$r1</span>; <span>//</span><span>$r1 stores calculation results</span><span>122</span><span> }
</span><span>123</span><span>124</span><span>/*</span><span> The operator only has addition and subtraction methods</span><span>*/</span><span>125</span><span>function</span> addSub(<span>$min</span>,<span>$max</span>,<span>$num1</span>, <span>$result </span><span>)
</span><span>126</span><span> {
</span><span>127</span><span>$str</span>=<span>mt_rand</span>(<span>$min</span>,<span>$max</span><span>);
</span><span>128</span><span>$re</span>=<span>$str</span><span>;
</span><span>129</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1;<span>$i</span>++<span>)
</span><span>130</span><span> {
</span><span>131</span><span>$a</span>[<span>$i</span>]= <span>mt_rand</span>(<span>$min</span>,<span>$max</span><span>);
</span><span>132</span><span>$c</span>=<span>mt_rand</span>(0,1<span>);
</span><span>133</span><span>if</span>(<span>$c</span>==0<span>)
</span><span>134</span><span> {
</span><span>135</span><span>$str</span>=<span>$str</span>." + ".<span>$a</span>[<span>$i</span><span>];
</span><span>136</span><span>$re</span>=<span>$re</span>+<span>$a</span>[<span>$i</span><span>];
</span><span>137</span><span> }
</span><span>138</span><span>if</span>(<span>$c</span>==1<span>)
</span><span>139</span><span> {
</span><span>140</span><span>$str</span>=<span>$str</span>." - ".<span>$a</span>[<span>$i</span><span>];
</span><span>141</span><span>$re</span>=<span>$re</span>-<span>$a</span>[<span>$i</span><span>];
</span><span>142</span><span> }
</span><span>143</span><span> }
</span><span>144</span><span>$result</span>->r1=<span>$re</span><span>;
</span><span>145</span><span>$str</span>=<span>$str</span>." = "<span>;
</span><span>146</span><span>return</span><span>$str</span><span>;
</span><span>147</span><span> }
</span><span>148</span><span>149</span><span>/*</span><span> The operator is the method of addition, subtraction and multiplication</span><span>*/</span><span>150</span><span>function</span> addSubMul(<span>$min</span>,<span>$max</span>,<span>$num1</span> ,<span>$ result</span><span>)
</span><span>151</span><span> {
</span><span>152</span><span>$a</span>[0]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>153</span><span>/*</span><span> Store the numbers and operators in the calculation into array $a </span><span>*/</span><span>154</span><span>/*</span><span>If spaces are added to the left and right sides of the operator in this loop, then in The operator in the if conditional statement in the subsequent while loop should also add spaces, otherwise an error will occur</span><span>*/</span><span>155</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$ num1-1);<span>$i</span>=<span>$i</span>+2) <span>//</span><span>(2*$num1-1) is the sum of the number of numbers and operators involved in the calculation </span><span>156</span><span> {
</span><span>157</span><span>$c</span>= <span>mt_rand</span>(0, 2<span>);
</span><span>158</span><span>if</span>(<span>$c</span>==0<span>)
</span><span>159</span><span> {
</span><span>160</span><span>$a</span>[<span>$i</span>]=' + '<span>;
</span><span>161</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>162</span><span> }</span><span>163</span><span>if</span>(<span>$c</span>==1<span>)
</span><span>164</span><span> {
</span><span>165</span><span>$a</span>[<span>$i</span>]=' - '<span>;
</span><span>166</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>167</span><span> }
</span><span>168</span><span>if</span>(<span>$c</span>==2<span>)
</span><span>169</span><span> {
</span><span>170</span><span>$a</span>[<span>$i</span>]=' x '<span>;
</span><span>171</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>172</span><span> }
</span><span>173</span><span> }
</span><span>174</span><span>/*</span><span> Store the multiplication formula in the array $amd </span><span>*/</span><span>175</span><span>$i</span>=0<span>;
</span><span>176</span><span>$j</span>=0<span>;
</span><span>177</span><span>while</span>(<span>$i</span>$num1-1)) <span>//Whether there are spaces around the operator should be consistent with the for loop above</span><span>178</span><span> {
</span><span>179</span><span>if</span>(<span>$a</span>[<span>$i</span>]==' x '<span>)
</span><span>180</span><span> {
</span><span>181</span><span>$amd</span>[<span>$j</span>-1]=<span>$amd</span>[<span>$j</span>-1]*<span>$a</span>[<span>$i</span>+1<span>];
</span><span>182</span><span>$i</span>=<span>$i</span>+2<span>;
</span><span>183</span><span> }
</span><span>184</span><span>else</span><span>185</span><span> {
</span><span>186</span><span>$amd</span>[<span>$j</span>]=<span>$a</span>[<span>$i</span><span>];
</span><span>187</span><span>$j</span>++<span>;
</span><span>188</span><span>$i</span>++<span>;
</span><span>189</span><span> }
</span><span>190</span><span> }
</span><span>191</span><span>/*</span><span> Calculate the answer to the equation $re </span><span>*/</span><span>192</span><span>$re</span>=<span>$amd</span>[0<span>];
</span><span>193</span><span>$k</span>=1<span>;
</span><span>194</span><span>while</span>(<span>$k</span>$j) <span>//Whether there are spaces around the operator should be consistent with the for loop above</span><span>195</span><span> {
</span><span>196</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' + '<span>)
</span><span>197</span><span> {
</span><span>198</span><span>$re</span>=<span>$re</span>+<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>199</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>200</span><span>continue</span><span>;
</span><span>201</span><span> }
</span><span>202</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' - '<span>)
</span><span>203</span><span> {
</span><span>204</span><span>$re</span>=<span>$re</span>-<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>205</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>206</span><span> }
</span><span>207</span><span> }
</span><span>208</span><span>/*</span><span> Concatenate the values in the array into a string calculation $str </span><span>*/</span><span>209</span><span>$str</span>=<span>$a</span>[0<span>];
</span><span>210</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1-1);<span>$i</span>++<span>)
</span><span>211</span><span> {
</span><span>212</span><span>$str</span>.=<span>$a</span>[<span>$i</span><span>];
</span><span>213</span><span> }
</span><span>214</span><span>$result</span>->r1=<span>$re</span><span>;
</span><span>215</span><span>$str</span>=<span>$str</span>." = "<span>;
</span><span>216</span><span>return</span><span>$str</span><span>;
</span><span>217</span><span> }</span><span>218</span><span>219</span><span>/*</span><span> The operators are addition and subtraction methods</span><span>*/</span><span>220</span><span>function</span> addSubDiv(<span>$min</span>,<span>$max</span>,<span>$num1</span> ,<span>$ result</span><span>)
</span><span>221</span><span> {
</span><span>222</span><span>$a</span>[0]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>223</span><span>/*</span><span> Store the numbers and operators in the calculation into array $a </span><span>*/</span><span>224</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1-1);<span>$i</span>=<span>$i</span>+2<span>)
</span><span>225</span><span> {
</span><span>226</span><span>$c</span>= <span>mt_rand</span>(0, 2<span>);
</span><span>227</span><span>if</span>(<span>$c</span>==0<span>)
</span><span>228</span><span> {
</span><span>229</span><span>$a</span>[<span>$i</span>]=' + '<span>;
</span><span>230</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>231</span><span> }
</span><span>232</span><span>if</span>(<span>$c</span>==1<span>)
</span><span>233</span><span> {
</span><span>234</span><span>$a</span>[<span>$i</span>]=' - '<span>;
</span><span>235</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>236</span><span> }
</span><span>237</span><span>if</span>(<span>$c</span>==2<span>)
</span><span>238</span><span> {
</span><span>239</span><span>$a</span>[<span>$i</span>]=' ÷ '<span>;
</span><span>240</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>241</span><span> }
</span><span>242</span><span> }
</span><span>243</span><span>/*</span><span> Store the calculated division formula in the array $amd </span><span>*/</span><span>244</span><span>$i</span>=0<span>;
</span><span>245</span><span>$j</span>=0<span>;
</span><span>246</span><span>while</span>(<span>$i</span>$num1-1<span>))
</span><span>247</span><span> {
</span><span>248</span><span>if</span>(<span>$a</span>[<span>$i</span>]==' ÷ '<span>)
</span><span>249</span><span> {
</span><span>250</span><span>while</span>((<span>$amd</span>[<span>$j</span>-1] % <span>$a</span>[<span>$i</span>+1]!=0) || <span>$a</span>[<span>$i</span>+ 1]==0 ) <span>//</span><span>Avoid division with remainder</span><span>251</span><span> {
</span><span>252</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>,<span>$max</span><span>);
</span><span>253</span><span> }
</span><span>254</span><span>$amd</span>[<span>$j</span>-1]=<span>$amd</span>[<span>$j</span>-1]/<span>$a</span>[<span>$i</span>+1<span>];
</span><span>255</span><span>$i</span>=<span>$i</span>+2<span>;
</span><span>256</span><span> }
</span><span>257</span><span>else</span><span>258</span><span> {
</span><span>259</span><span>$amd</span>[<span>$j</span>]=<span>$a</span>[<span>$i</span><span>];
</span><span>260</span><span>$j</span>++<span>;
</span><span>261</span><span>$i</span>++<span>;
</span><span>262</span><span> }
</span><span>263</span><span> }
</span><span>264</span><span>/*</span><span> Calculate the answer to the equation $re </span><span>*/</span><span>265</span><span>$re</span>=<span>$amd</span>[0<span>];
</span><span>266</span><span>$k</span>=1<span>;
</span><span>267</span><span>while</span>(<span>$k</span>$j<span>)
</span><span>268</span><span> {
</span><span>269</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' + '<span>)
</span><span>270</span><span> {
</span><span>271</span><span>$re</span>=<span>$re</span>+<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>272</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>273</span><span>continue</span><span>;
</span><span>274</span><span> }
</span><span>275</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' - '<span>)
</span><span>276</span><span> {
</span><span>277</span><span>$re</span>=<span>$re</span>-<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>278</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>279</span><span> }
</span><span>280</span><span> }</span><span>281</span><span>282</span><span>/*</span><span> Put the calculation into the string $str </span><span>*/</span><span>283</span><span>$str</span>=<span>$a</span>[0<span>];
</span><span>284</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1-1);<span>$i</span>++<span>)
</span><span>285</span><span> {
</span><span>286</span><span>$str</span>.=<span>$a</span>[<span>$i</span><span>];
</span><span>287</span><span> }
</span><span>288</span><span>$result</span>->r1=<span>$re</span><span>;
</span><span>289</span><span>$str</span>=<span>$str</span>." = "<span>;
</span><span>290</span><span>return</span><span>$str</span><span>;
</span><span>291</span><span> }
</span><span>292</span><span>293</span><span>/*</span><span> The operators are addition, subtraction, multiplication and division methods</span><span>*/</span><span>294</span><span>function</span> addSubMulDiv(<span>$min</span>,<span>$max</span>,<span>$num1 </span>,<span>$ result</span><span>)
</span><span>295</span><span> {
</span><span>296</span><span>$a</span>[0]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>297</span><span>/*</span><span> Store the numbers and operators in the calculation into array $a </span><span>*/</span><span>298</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1-1);<span>$i</span>=<span>$i</span>+2<span>)
</span><span>299</span><span> {
</span><span>300</span><span>$c</span>= <span>mt_rand</span>(0, 3<span>);
</span><span>301</span><span>if</span>(<span>$c</span>==0<span>)
</span><span>302</span><span> {
</span><span>303</span><span>$a</span>[<span>$i</span>]=' + '<span>;
</span><span>304</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>305</span><span> }
</span><span>306</span><span>if</span>(<span>$c</span>==1<span>)
</span><span>307</span><span> {
</span><span>308</span><span>$a</span>[<span>$i</span>]=' - '<span>;
</span><span>309</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>310</span><span> }
</span><span>311</span><span>if</span>(<span>$c</span>==2<span>)
</span><span>312</span><span> {
</span><span>313</span><span>$a</span>[<span>$i</span>]=' x '<span>;
</span><span>314</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>315</span><span> }
</span><span>316</span><span>if</span>(<span>$c</span>==3<span>)
</span><span>317</span><span> {
</span><span>318</span><span>$a</span>[<span>$i</span>]=' ÷ '<span>;
</span><span>319</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>, <span>$max</span><span>);
</span><span>320</span><span> }
</span><span>321</span><span> }
</span><span>322</span><span>/*</span><span> Store the calculated division formula in the array $amd </span><span>*/</span><span>323</span><span>$i</span>=0<span>;
</span><span>324</span><span>$j</span>=0<span>;
</span><span>325</span><span>while</span>(<span>$i</span>$num1-1<span>))
</span><span>326</span><span> {
</span><span>327</span><span>if</span>(<span>$a</span>[<span>$i</span>]==' x '<span>)
</span><span>328</span><span> {
</span><span>329</span><span>$amd</span>[<span>$j</span>-1]=<span>$amd</span>[<span>$j</span>-1]*<span>$a</span>[<span>$i</span>+1<span>];
</span><span>330</span><span>$i</span>=<span>$i</span>+2<span>;
</span><span>331</span><span> }
</span><span>332</span><span>else</span><span>if</span>(<span>$a</span>[<span>$i</span>]==' ÷ '<span>)
</span><span>333</span><span> {
</span><span>334</span><span>while</span>((<span>$amd</span>[<span>$j</span>-1] % <span>$a</span>[<span>$i</span>+1]!=0) || <span>$a</span>[<span>$i</span>+ 1]==0 ) <span>//</span><span>Avoid division with remainder</span><span>335</span><span> {
</span><span>336</span><span>$a</span>[<span>$i</span>+1]= <span>mt_rand</span>(<span>$min</span>,<span>$max</span><span>);
</span><span>337</span><span> }
</span><span>338</span><span>$amd</span>[<span>$j</span>-1]=<span>$amd</span>[<span>$j</span>-1]/<span>$a</span>[<span>$i</span>+1<span>];
</span><span>339</span><span>$i</span>=<span>$i</span>+2<span>;
</span><span>340</span><span> }
</span><span>341</span><span>else</span><span>342</span><span> {
</span><span>343</span><span>$amd</span>[<span>$j</span>]=<span>$a</span>[<span>$i</span><span>];
</span><span>344</span><span>$j</span>++<span>;
</span><span>345</span><span>$i</span>++<span>;
</span><span>346</span><span> }
</span><span>347</span><span> }</span><span>348</span><span>/*</span><span> Calculate the answer to the equation $re </span><span>*/</span><span>349</span><span>$re</span>=<span>$amd</span>[0<span>];
</span><span>350</span><span>$k</span>=1<span>;
</span><span>351</span><span>while</span>(<span>$k</span>$j<span>)
</span><span>352</span><span> {
</span><span>353</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' + '<span>)
</span><span>354</span><span> {
</span><span>355</span><span>$re</span>=<span>$re</span>+<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>356</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>357</span><span>continue</span><span>;
</span><span>358</span><span> }
</span><span>359</span><span>if</span>(<span>$amd</span>[<span>$k</span>]==' - '<span>)
</span><span>360</span><span> {
</span><span>361</span><span>$re</span>=<span>$re</span>-<span>$amd</span>[<span>$k</span>+1<span>];
</span><span>362</span><span>$k</span>=<span>$k</span>+2<span>;
</span><span>363</span><span> }
</span><span>364</span><span> }
</span><span>365</span><span>/*</span><span> Put the calculation into the string $str </span><span>*/</span><span>366</span><span>$str</span>=<span>$a</span>[0<span>];
</span><span>367</span><span>for</span>(<span>$i</span>=1;<span>$i</span>$num1-1);<span>$i</span>++<span>)
</span><span>368</span><span> {
</span><span>369</span><span>$str</span>.=<span>$a</span>[<span>$i</span><span>];
</span><span>370</span><span> }
</span><span>371</span><span>$result</span>->r1=<span>$re</span><span>;
</span><span>372</span><span>$str</span>=<span>$str</span>." = "<span>;
</span><span>373</span><span>return</span><span>$str</span><span>;
</span><span>374</span><span> }
</span><span>375</span><span>376</span><span>$r</span>= <span>new</span><span> Result();
</span><span>377</span><span>378</span><span>/*</span><span> Addition and subtraction of two numbers</span><span>*/</span><span>379</span><span>if</span>((<span>$num1</span>==2) && (<span>$mul</span>=='f ') && (<span>$div</span>=='f'<span>))
</span><span>380</span><span> {
</span><span>381</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>382</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>383</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>384</span><span> {
</span><span>385</span><span>$j</span>=0<span>;
</span><span>386</span><span>$bool</span>=<span>true</span><span>;
</span><span>387</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>388</span><span>while</span>((<span>$r</span>->r1)//<span>When the result is negative, re-random </span><span>389</span><span> {
</span><span>390</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>391</span><span> }
</span><span>392</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Avoid duplication</span><span>393</span><span> {
</span><span>394</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>395</span><span> {
</span><span>396</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>397</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>398</span><span> {
</span><span>399</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>400</span><span> }
</span><span>401</span><span>$j</span>=0<span>;
</span><span>402</span><span> }
</span><span>403</span><span>$j</span>++<span>;
</span><span>404</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>405</span><span> {
</span><span>406</span><span>$bool</span>=<span>false</span><span>;
</span><span>407</span><span> }
</span><span>408</span><span> }</span><span>409</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>410</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>411</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>412</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>413</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>414</span><span> }
</span><span>415</span><span>fclose</span>(<span>$question</span><span>);
</span><span>416</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>417</span><span> }
</span><span>418</span><span>419</span><span>/*</span><span> Addition, subtraction and multiplication of two numbers</span><span>*/</span><span>420</span><span>if</span>((<span>$num1</span>==2) && (<span>$mul</span>=='t ') && (<span>$div</span>=='f'<span>))
</span><span>421</span><span> {
</span><span>422</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>423</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>424</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>425</span><span> {
</span><span>426</span><span>$j</span>=0<span>;
</span><span>427</span><span>$bool</span>=<span>true</span><span>;
</span><span>428</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>429</span><span>while</span>((<span>$r</span>->r1)//<span>When the result is negative, re-random </span><span>430</span><span> {
</span><span>431</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>432</span><span> }
</span><span>433</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Avoid duplication</span><span>434</span><span> {
</span><span>435</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>436</span><span> {
</span><span>437</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>438</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>439</span><span> {
</span><span>440</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>441</span><span> }
</span><span>442</span><span>$j</span>=0<span>;
</span><span>443</span><span> }
</span><span>444</span><span>$j</span>++<span>;
</span><span>445</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>446</span><span> {
</span><span>447</span><span>$bool</span>=<span>false</span><span>;
</span><span>448</span><span> }
</span><span>449</span><span> }
</span><span>450</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>451</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>452</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>453</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>454</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>455</span><span> }
</span><span>456</span><span>fclose</span>(<span>$question</span><span>);
</span><span>457</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>458</span><span> }</span><span>459</span><span>460</span><span>/*</span><span> Addition and subtraction of two numbers</span><span>*/</span><span>461</span><span>if</span>((<span>$num1</span>==2) && (<span>$mul</span>=='f ') && (<span>$div</span>=='t'<span>))
</span><span>462</span><span> {
</span><span>463</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>464</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>465</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>466</span><span> {
</span><span>467</span><span>$j</span>=0<span>;
</span><span>468</span><span>$bool</span>=<span>true</span><span>;
</span><span>469</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>470</span><span>while</span>((<span>$r</span>->r1)//<span>When the result is negative, re-random </span><span>471</span><span> {
</span><span>472</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>473</span><span> }
</span><span>474</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Avoid duplication</span><span>475</span><span> {
</span><span>476</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>477</span><span> {
</span><span>478</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>479</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>480</span><span> {
</span><span>481</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>482</span><span> }
</span><span>483</span><span>$j</span>=0<span>;
</span><span>484</span><span> }
</span><span>485</span><span>$j</span>++<span>;
</span><span>486</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>487</span><span> {
</span><span>488</span><span>$bool</span>=<span>false</span><span>;
</span><span>489</span><span> }
</span><span>490</span><span> }
</span><span>491</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>492</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>493</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>494</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>495</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>496</span><span> }
</span><span>497</span><span>fclose</span>(<span>$question</span><span>);
</span><span>498</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>499</span><span> }
</span><span>500</span><span>501</span><span>/*</span><span> Addition, subtraction, multiplication and division of two numbers</span><span>*/</span><span>502</span><span>if</span>((<span>$num1</span>==2) && (<span>$mul</span>==' t') && (<span>$div</span>=='t'<span>))
</span><span>503</span><span> {
</span><span>504</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>505</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>506</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>507</span><span> {
</span><span>508</span><span>$j</span>=0<span>;
</span><span>509</span><span>$bool</span>=<span>true</span><span>;
</span><span>510</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>511</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>512</span><span> {
</span><span>513</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>514</span><span> }</span><span>515</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>516</span><span> {
</span><span>517</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>518</span><span> {
</span><span>519</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>520</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>521</span><span> {
</span><span>522</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>523</span><span> }
</span><span>524</span><span>$j</span>=0<span>;
</span><span>525</span><span> }
</span><span>526</span><span>$j</span>++<span>;
</span><span>527</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>528</span><span> {
</span><span>529</span><span>$bool</span>=<span>false</span><span>;
</span><span>530</span><span> }
</span><span>531</span><span> }
</span><span>532</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>533</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>534</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>535</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>536</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>537</span><span> }
</span><span>538</span><span>fclose</span>(<span>$question</span><span>);
</span><span>539</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>540</span><span> }
</span><span>541</span><span>542</span><span>/*</span><span> Addition and subtraction of three numbers</span><span>*/</span><span>543</span><span>if</span>((<span>$num1</span>==3) && (<span>$mul</span>=='f ') && (<span>$div</span>=='f'<span>))
</span><span>544</span><span> {
</span><span>545</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>546</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>547</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>548</span><span> {
</span><span>549</span><span>$j</span>=0<span>;
</span><span>550</span><span>$bool</span>=<span>true</span><span>;
</span><span>551</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>552</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>553</span><span> {
</span><span>554</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>555</span><span> }
</span><span>556</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>557</span><span> {
</span><span>558</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>559</span><span> {
</span><span>560</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>561</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>562</span><span> {
</span><span>563</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>564</span><span> }
</span><span>565</span><span>$j</span>=0<span>;
</span><span>566</span><span> }
</span><span>567</span><span>$j</span>++<span>;
</span><span>568</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>569</span><span> {
</span><span>570</span><span>$bool</span>=<span>false</span><span>;
</span><span>571</span><span> }
</span><span>572</span><span> }</span><span>573</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>574</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>575</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>576</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>577</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>578</span><span> }
</span><span>579</span><span>fclose</span>(<span>$question</span><span>);
</span><span>580</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>581</span><span> }
</span><span>582</span><span>583</span><span>/*</span><span> Addition, subtraction and multiplication of three numbers</span><span>*/</span><span>584</span><span>if</span>((<span>$num1</span>==3) && (<span>$mul</span>=='t ') && (<span>$div</span>=='f'<span>))
</span><span>585</span><span> {
</span><span>586</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>587</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>588</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>589</span><span> {
</span><span>590</span><span>$j</span>=0<span>;
</span><span>591</span><span>$bool</span>=<span>true</span><span>;
</span><span>592</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>593</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>594</span><span> {
</span><span>595</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>596</span><span> }
</span><span>597</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>598</span><span> {
</span><span>599</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>600</span><span> {
</span><span>601</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>602</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>603</span><span> {
</span><span>604</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>605</span><span> }
</span><span>606</span><span>$j</span>=0<span>;
</span><span>607</span><span> }
</span><span>608</span><span>$j</span>++<span>;
</span><span>609</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>610</span><span> {
</span><span>611</span><span>$bool</span>=<span>false</span><span>;
</span><span>612</span><span> }
</span><span>613</span><span> }
</span><span>614</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>615</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>616</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>617</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>618</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>619</span><span> }
</span><span>620</span><span>fclose</span>(<span>$question</span><span>);
</span><span>621</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>622</span><span> }</span><span>623</span><span>624</span><span>/*</span><span> Addition, subtraction and division of three numbers</span><span>*/</span><span>625</span><span>if</span>((<span>$num1</span>==3) && (<span>$mul</span>=='f ') && (<span>$div</span>=='t'<span>))
</span><span>626</span><span> {
</span><span>627</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>628</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>629</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>630</span><span> {
</span><span>631</span><span>$j</span>=0<span>;
</span><span>632</span><span>$bool</span>=<span>true</span><span>;
</span><span>633</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>634</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>635</span><span> {
</span><span>636</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>637</span><span> }
</span><span>638</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>639</span><span> {
</span><span>640</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>641</span><span> {
</span><span>642</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>643</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>644</span><span> {
</span><span>645</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>646</span><span> }
</span><span>647</span><span>$j</span>=0<span>;
</span><span>648</span><span> }
</span><span>649</span><span>$j</span>++<span>;
</span><span>650</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>651</span><span> {
</span><span>652</span><span>$bool</span>=<span>false</span><span>;
</span><span>653</span><span> }
</span><span>654</span><span> }
</span><span>655</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>656</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>657</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>658</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>659</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>660</span><span> }
</span><span>661</span><span>fclose</span>(<span>$question</span><span>);
</span><span>662</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>663</span><span> }
</span><span>664</span><span>665</span><span>/*</span><span> Addition, subtraction, multiplication and division of three numbers</span><span>*/</span><span>666</span><span>if</span>((<span>$num1</span>==3) && (<span>$mul</span>==' t') && (<span>$div</span>=='t'<span>))
</span><span>667</span><span> {
</span><span>668</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>669</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>670</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>671</span><span> {
</span><span>672</span><span>$j</span>=0<span>;
</span><span>673</span><span>$bool</span>=<span>true</span><span>;
</span><span>674</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>675</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>676</span><span> {
</span><span>677</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>678</span><span> }</span><span>679</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>680</span><span> {
</span><span>681</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>682</span><span> {
</span><span>683</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>684</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>685</span><span> {
</span><span>686</span><span>$b</span>[<span>$i</span>]= addSubMulDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>687</span><span> }
</span><span>688</span><span>$j</span>=0<span>;
</span><span>689</span><span> }
</span><span>690</span><span>$j</span>++<span>;
</span><span>691</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>692</span><span> {
</span><span>693</span><span>$bool</span>=<span>false</span><span>;
</span><span>694</span><span> }
</span><span>695</span><span> }
</span><span>696</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>697</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>698</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>699</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>700</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>701</span><span> }
</span><span>702</span><span>fclose</span>(<span>$question</span><span>);
</span><span>703</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>704</span><span> }
</span><span>705</span><span>706</span><span>/*</span><span> Addition and subtraction of four numbers</span><span>*/</span><span>707</span><span>if</span>((<span>$num1</span>==4) && (<span>$mul</span>=='f ') && (<span>$div</span>=='f'<span>))
</span><span>708</span><span> {
</span><span>709</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>710</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>711</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>712</span><span> {
</span><span>713</span><span>$j</span>=0<span>;
</span><span>714</span><span>$bool</span>=<span>true</span><span>;
</span><span>715</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>716</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>717</span><span> {
</span><span>718</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>719</span><span> }
</span><span>720</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>721</span><span> {
</span><span>722</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>723</span><span> {
</span><span>724</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>725</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>726</span><span> {
</span><span>727</span><span>$b</span>[<span>$i</span>]= addSub(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>728</span><span> }
</span><span>729</span><span>$j</span>=0<span>;
</span><span>730</span><span> }
</span><span>731</span><span>$j</span>++<span>;
</span><span>732</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>733</span><span> {
</span><span>734</span><span>$bool</span>=<span>false</span><span>;
</span><span>735</span><span> }
</span><span>736</span><span> }</span><span>737</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>738</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>739</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>740</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>741</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>742</span><span> }
</span><span>743</span><span>fclose</span>(<span>$question</span><span>);
</span><span>744</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>745</span><span> }
</span><span>746</span><span>747</span><span>/*</span><span> Addition, subtraction and multiplication of four numbers</span><span>*/</span><span>748</span><span>if</span>((<span>$num1</span>==4) && (<span>$mul</span>=='t ') && (<span>$div</span>=='f'<span>))
</span><span>749</span><span> {
</span><span>750</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>751</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>752</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>753</span><span> {
</span><span>754</span><span>$j</span>=0<span>;
</span><span>755</span><span>$bool</span>=<span>true</span><span>;
</span><span>756</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>757</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>758</span><span> {
</span><span>759</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>760</span><span> }
</span><span>761</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>762</span><span> {
</span><span>763</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>764</span><span> {
</span><span>765</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>766</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>767</span><span> {
</span><span>768</span><span>$b</span>[<span>$i</span>]= addSubMul(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>769</span><span> }
</span><span>770</span><span>$j</span>=0<span>;
</span><span>771</span><span> }
</span><span>772</span><span>$j</span>++<span>;
</span><span>773</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>774</span><span> {
</span><span>775</span><span>$bool</span>=<span>false</span><span>;
</span><span>776</span><span> }
</span><span>777</span><span> }
</span><span>778</span><span>echo</span> "( ".(<span>$i</span>+1)." ) ".<span>$b</span>[<span>$i</span>]."<br><br>"<span>;
</span><span>779</span><span>$d</span>[<span>$i</span>]=<span>$b</span>[<span>$i</span>]."n"<span>;
</span><span>780</span><span>$e</span>[<span>$i</span>]=<span>$r</span>->r1."n"<span>;
</span><span>781</span><span>fwrite</span>(<span>$question</span>,<span>$d</span>[<span>$i</span><span>]);
</span><span>782</span><span>fwrite</span>(<span>$answer</span>,<span>$e</span>[<span>$i</span><span>]);
</span><span>783</span><span> }
</span><span>784</span><span>fclose</span>(<span>$question</span><span>);
</span><span>785</span><span>fclose</span>(<span>$answer</span><span>);
</span><span>786</span><span> }</span><span>787</span><span>788</span><span>/*</span><span> Addition, subtraction and division of four numbers</span><span>*/</span><span>789</span><span>if</span>((<span>$num1</span>==4) && (<span>$mul</span>=='f ') && (<span>$div</span>=='t'<span>))
</span><span>790</span><span> {
</span><span>791</span><span>$question</span> = <span>fopen</span>("question.txt", "w"<span>);
</span><span>792</span><span>$answer</span>= <span>fopen</span>("answer.txt", "w"<span>);
</span><span>793</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$num;<span>$i</span>++<span>)
</span><span>794</span><span> {
</span><span>795</span><span>$j</span>=0<span>;
</span><span>796</span><span>$bool</span>=<span>true</span><span>;
</span><span>797</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>798</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>799</span><span> {
</span><span>800</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>801</span><span> }
</span><span>802</span><span>while</span>((<span>$bool</span>) && (<span>$i</span>!=0))<span>//</span><span>Judge duplicate</span><span>803</span><span> {
</span><span>804</span><span>while</span>(<span>$b</span>[<span>$i</span>]==<span>$b</span>[<span>$j</span><span>])
</span><span>805</span><span> {
</span><span>806</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>807</span><span>while</span>((<span>$r</span>->r1)//<span>The result is negative, re-question </span><span>808</span><span> {
</span><span>809</span><span>$b</span>[<span>$i</span>]= addSubDiv(<span>$min</span>, <span>$max</span>, <span>$num1</span>, <span>$r</span><span>);
</span><span>810</span><span> }
</span><span>811</span><span>$j</span>=0<span>;
</span><span>812</span><span> }
</span><span>813</span><span>$j</span>++<span>;
</span><span>814</span><span>if</span>(<span>$j</span>==<span>$i</span><span>)
</span><span>815</span><span> {
</span><span>816</span><span>$bool</span>=<span>false</span><span>;
</span><span>817</span><span></span>Copy after login
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Best practices are learned from mistakes, so here we've summarized some of the most common mistakes we encounter and provided methods, ideas, and resources on how to best resolve them. 1. Not using a virtual environment is not a coding problem in itself, but I still think it is a very good practice to isolate the environment for each type of project. Why use a dedicated environment for each project? The first reason is the problem of Python's own package management. We want to minimize conflicts between packages and versions. Another reason is that our code and dependencies can be easily deployed to any location using a virtual environment starting from Anaconda or Pipenv. If you want to go deeper then Docker is the first choice. 2. Excessive use of J
For a software project, what is the largest percentage of the total workload?
Jan 22, 2021 am 11:54 AM
For a software project, the tasks that account for the largest percentage of the total workload are: testing and debugging. The purpose of testing is to find defects in the program, and the purpose of debugging is to locate and solve problems in the program. Testing occurs throughout the entire software life cycle, and debugging is generally during the development phase.
In-depth understanding of Go programming philosophy and software engineering
Nov 30, 2023 am 09:25 AM
Deeply understand the programming philosophy and software engineering of the Go language. As an emerging programming language, the Go language is increasingly attracting the attention and love of developers for its simplicity, efficiency, and reliability. It is not only widely used in Google's internal projects, but also has achieved outstanding results in development in various fields. To have a deep understanding of the programming philosophy and software engineering of the Go language, we must start from its design principles, standard libraries, and engineering practices. First of all, the programming philosophy of Go language is concise, clear and readable. It advocates a natural language approach
Huawei launches 5 software engineering textbooks: based on Kunpeng, open source Hongmeng OpenHarmony, openEuler, etc.
Aug 19, 2024 am 04:52 AM
According to news from this site on August 18, Huawei’s official Weibo account for ICT talent training stated that in order to solve the problem of the lack of a teaching material system based on independently innovative software systems in the core textbooks of my country’s software engineering majors, the Demonstration Software Academy Alliance, Higher Education Press, and Huawei Technology Co., Ltd. and university teachers collaborated to create a series of 10 software engineering textbooks. This first batch of five pilot application textbooks has been launched. The specific introduction is attached as follows: "Computer Organization and Structure Experimental Tutorial - Based on Kunpeng Processor" This book is for related courses such as "Computer Composition and Structure" and "Computer Composition Principles" The experimental guidance book is designed based on Huawei's Kunpeng processor technology. It uses Huawei Cloud as the experimental environment and writes programs in C language and assembly language to drive the Kunpeng processor operation.
Microsoft moves more people to AI in Windows
Sep 17, 2023 pm 08:25 PM
Microsoft will continue to build AI in Windows. Not long ago, the Redmond-based tech giant opened a position on its Windows Incubation team to build more AI-driven experiences across a range of devices – previously working on Windows 365. According to Microsoft's job center page, the team is looking for new software engineers at the senior and lead levels, as well as a software engineering manager to "imagine and build new web, cloud streaming, and AI-driven experiences across a range of devices." . Minimum 2 years of experience required. For the Software Engineer position, you will be responsible for the Windows platform, operating system/chip integration, cloud/client design
