Software Engineering Pairing Assignment 02, Software Engineering Pairing 02
1. Design Idea:
I used php to implement the main functions of this task. By default, addition and subtraction must be included.
First, create the index.php file and create a form in the HTML statement. The content of the form includes the number of questions and 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 value 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 later use.
Third, create submitAnswer.php , acceptAnswer.php , deleteAnswer.php and judgeAnswer.php files are used to submit answers online, receive answers, delete answers and judge answers respectively. The submitted answers are placed in the answer1.txt file. The answers are judged by comparing answer.txt and The content in the answer1.txt file is enough.
2. Source program code
1 index.
php
2
3
9
10
11 12 Four arithmetic calculation system
13 <script>
<span> 14</span> <span>function</span><span> check() {
</span><span> 15</span> <span>var</span> tt=/^(0|[1-9]d*)$/<span>;
</span><span> 16</span> <span>if</span>(!tt.test(form1.<span>min</span>.<span>value))
</span><span> 17</span> <span> {
</span><span> 18</span> alert('The minimum value input is illegal'<span>);
</span><span> 19</span> form1.<span>min</span>.<span>focus();
</span><span> 20</span> <span>return</span> <span>false</span><span>;
</span><span> 21</span> <span> }
</span><span> 22</span> <span>if</span>(!tt.test(form1.<span>max</span>.value) || (form1.<span>max</span>.value< form1.<span>min</span>.<span>value))
</span><span> 23</span> <span> {
</span><span> 24</span> alert('The maximum value input is illegal'<span>);
</span><span> 25</span> form1.<span>min</span>.<span>focus();
</span><span> 26</span> <span>return</span> <span>false</span><span>;
</span><span> 27</span> <span> }
</span><span> 28</span> <span>if</span>(!tt.test(form1.num.value) || (form1.num.value==0<span>))
</span><span> 29</span> <span> {
</span><span> 30</span> alert('The number of questions entered is illegal'<span>);
</span><span> 31</span> form1.num.<span>focus();
</span><span> 32</span> <span>return</span> <span>false</span><span>;
</span><span> 33</span> <span> }
</span><span> 34</span> <span>return</span> <span>true</span><span>;
</span><span> 35</span> <span> }</span><span> 36</span> </script>
37
38
39 Login Register
40
41
42 Welcome to the primary school four arithmetic operation question system 43
44
72
73
74
75
76 rubric.
php
77
78
79
80 81 Question setting interface
82
83
84
85 php
86 if (
is_numeric (
$_POST ["max"
]))
87 {
88 $max =
$_POST ["max"];
// maximum value
89 }
90 if (
is_numeric (
$_POST ["min"
]))
91 {
92 $min =
$_POST ["min"];
// Minimum value
93 }
94 if (
is_numeric (
$_POST ["num"
]))
95 {
96 $num =
$_POST ["num"];
// Number of questions
97 } 98 if (
is_numeric (
$_POST ["num1"
]))
99 {
100 $num1 =
$_POST ["num1"];
// Number of items participating in the operation
101 }
102 if (
is_string (
$_POST ["mul"
]))
103 {
104 $mul =
$_POST ["mul"];
// Choose whether to add multiplication or not is t Nof
105 }
106 if (
is_string (
$_POST ["div"
]))
107 {
108 $div =
$_POST ["div"];
// Choose whether to add division is t Nof
109 }
110
111 /* Define array */
112 $a =
array ();
// Used in the
method to store random numbers and operators
113 $amd =
array ();
// is used in the method to calculate the calculation after multiplication/division Store in this array
114 $b =
array ();
// Use when calling a method
115 $d =
array ();
// Storage question
116 $e =
array ();
// store answer
117
118 /* The Result class is used to encapsulate the result */
119 class Result
120 {
121 public $r1 ;
// $r1 stores the calculation result
122 }
123
124 /* Operators only have addition and subtraction methods */
125 function addSub(
$min ,
$max ,
$num1 ,
$result )
126 {
127 $str =
mt_rand (
$min ,
$max );
128 $re =
$str ;
129 for (
$i =1;
$i <
$num1 ;
$i )
130 {
131 $a [
$i ]=
mt_rand (
$min ,
$ max );
132 $c =
mt_rand (0,1
);
133 if (
$c ==0
)
134 {
135 $str =
$str ." ".
$a [
$i ];
136 $re =
$re $a [
$i ];
137 }
138 if (
$c ==1
)
139 {
140 $str =
$str ." - ".
$a [
$i ];
141 $re =
$re -
$a [
$i ];
142 }
143 }
144 $result ->r1=
$re ;
145 $str =
$str ." = "
;
146 return $str ;
147 } 148
149 /* The operators are addition, subtraction and multiplication methods */
150 function addSubMul(
$min ,
$max ,
$num1 ,
$result )
151 {
152 $a [0]=
mt_rand (
$min ,
$max );
153 /* Store the numbers and operators in the calculation into the array $a */
154 /* If spaces are added to the left and right sides of the operator in this loop, spaces should also be added to the operator in the if conditional statement in the subsequent while loop. Otherwise, an error will occur */
155 for (
$i =1;
$i <(2*
$num1 -1) ;
$i =
$i 2)
// (2*$num1-1) is the number of numbers and operators involved in the calculation Sum of numbers
156 {
157 $c =
mt_rand (0, 2
);
158 if (
$c ==0
)
159 {
160 $a [
$i ]=' '
;
161 $a [
$i 1]=
mt_rand (
$min ,
$max );
162 }
163 if (
$c ==1
)
164 {
165 $a [
$i ]=' - '
;
166 $a [
$i 1]=
mt_rand (
$min ,
$max );
167 }
168 if (
$c ==2
)
169 {
170 $a [
$i ]=' x '
;
171 $a [
$i 1]=
mt_rand (
$min ,
$max );
172 }
173 }
174 /* Store the multiplication in the calculation into the array $amd */
175 $i =0
;
176 $j =0
;
177 while (
$i <(2*
$num1 -1))
// Whether there are spaces around the operator should be consistent with the for loop above
178 {
179 if (
$a [
$i ]==' x '
)
180 {
181 $amd [
$j -1]=
$amd [
$j -1 ]*
$a [
$i 1
];
182 $i =
$i 2
;
183 }
184 else
185 {
186 $amd [
$j ]=
$a [
$i ] ;
187 $j ;
188 $i ;
189 }
190 }
191 /* Calculate the answer to the equation $re */
192 $re =
$amd [0
];
193 $k =1
;
194 while (
$k <
$j )
// operator Whether there are spaces on the left and right should be consistent with the for loop above
195 {
196 if (
$amd [
$k ]==' '
)
197 {
198 $re =
$re $amd [
$k 1
];
199 $k =
$k 2
;
200 continue ;
201 } 202 if (
$amd [
$k ]==' - '
)
203 {
204 $re =
$re -
$amd [
$k 1
] ;
205 $k =
$k 2
;
206 }
207 }
208 /* Concatenate the values in the array into a string calculation $str */
209 $str =
$a [0
];
210 for (
$i =1;
$i <(2*
$num1 -1);
$i )
211 {
212 $str .=
$a [
$i ];
213 }
214 $result ->r1=
$re ;
215 $str =
$str ." = "
;
216 return $str ;
217 }
218
219 /* The operators are addition, subtraction and division methods */
220 function addSubDiv(
$min ,
$max ,
$num1 ,
$result )
221 {
222 $a [0]=
mt_rand (
$min ,
$max );
223 /* Store the numbers and operators in the calculation into the array $a */
224 for (
$i =1;
$i <(2*
$num1 -1) ;
$i =
$i 2
)
225 {
226 $c =
mt_rand (0, 2
);
227 if (
$c ==0
)
228 {
229 $a [
$i ]=' '
;
230 $a [
$i 1]=
mt_rand (
$min ,
$max );
231 }
232 if (
$c ==1
)
233 {
234 $a [
$i ]=' - '
;
235 $a [
$i 1]=
mt_rand (
$min ,
$max );
236 }
237 if (
$c ==2
)
238 {
239 $a [
$i ]=' ÷ '
;
240 $a [
$i 1]=
mt_rand (
$min ,
$max );
241 }
242 }
243 /* Store the calculation after division in the calculation into the array $amd */
244 $i =0
;
245 $j =0
;
246 while (
$i <(2*
$num1 -1
))
247 {
248 if (
$a [
$i ]==' ÷ '
)
249 {
250 while ((
$amd [
$j -1] %
$a [
$i 1]!=0) ||
$a [
$i 1]==0 )
// Avoid Division has remainder
251 {
252 $a [
$i 1]=
mt_rand (
$min ,
$max );
253 }
254 $amd [
$j -1]=
$amd [
$j -1 ]/
$a [
$i 1
];
255 $i =
$i 2
;
256 } 257 else
258 {
259 $amd [
$j ]=
$a [
$i ] ;
260 $j ;
261 $i ;
262 }
263 }
264 /* Calculate the answer to the equation $re */
265 $re =
$amd [0
];
266 $k =1
;
267 while (
$k <
$j )
268 {
269 if (
$amd [
$k ]==' '
)
270 {
271 $re =
$re $amd [
$k 1
];
272 $k =
$k 2
;
273 continue ;
274 }
275 if (
$amd [
$k ]==' - '
)
276 {
277 $re =
$re -
$amd [
$k 1
] ;
278 $k =
$k 2
;
279 }
280 }
281
282 /* Put the calculation into the string $str */
283 $str =
$a [0
];
284 for (
$i =1;
$i <(2*
$num1 -1);
$i )
285 {
286 $str .=
$a [
$i ];
287 }
288 $result ->r1=
$re ;
289 $str =
$str ." = "
;
290 return $str ;
291 }
292
293 /* The operators are addition, subtraction, multiplication and division methods */
294 function addSubMulDiv(
$min ,
$max ,
$num1 ,
$result )
295 {
296 $a [0]=
mt_rand (
$min ,
$max );
297 /* Store the numbers and operators in the calculation into the array $a */
298 for (
$i =1;
$i <(2*
$num1 -1) ;
$i =
$i 2
)
299 {
300 $c =
mt_rand (0, 3
);
301 if (
$c ==0
)
302 {
303 $a [
$i ]=' '
;
304 $a [
$i 1]=
mt_rand (
$min ,
$max );
305 }
306 if (
$c ==1
)
307 {
308 $a [
$i ]=' - '
;
309 $a [
$i 1]=
mt_rand (
$min ,
$max );
310 }
311 if (
$c ==2
)
312 {
313 $a [
$i ]=' x '
;
314 $a [
$i 1]=
mt_rand (
$min ,
$max );
315 } 316 if (
$c ==3
)
317 {
318 $a [
$i ]=' ÷ '
;
319 $a [
$i 1]=
mt_rand (
$min ,
$max );
320 }
321 }
322 /* Store the calculation after division in the calculation into the array $amd */
323 $i =0
;
324 $j =0
;
325 while (
$i <(2*
$num1 -1
))
326 {
327 if (
$a [
$i ]==' x '
)
328 {
329 $amd [
$j -1]=
$amd [
$j -1 ]*
$a [
$i 1
];
330 $i =
$i 2
;
331 }
332 else if (
$a [
$i ]==' ÷ '
)
333 {
334 while ((
$amd [
$j -1] %
$a [
$i 1]!=0) ||
$a [
$i 1]==0 )
// Avoid Division has remainder
335 {
336 $a [
$i 1]=
mt_rand (
$min ,
$max );
337 }
338 $amd [
$j -1]=
$amd [
$j -1 ]/
$a [
$i 1
];
339 $i =
$i 2
;
340 }
341 else
342 {
343 $amd [
$j ]=
$a [
$i ] ;
344 $j ;
345 $i ;
346 }
347 }
348 /* Calculate the answer to the equation $re */
349 $re =
$amd [0
];
350 $k =1
;
351 while (
$k <
$j )
352 {
353 if (
$amd [
$k ]==' '
)
354 {
355 $re =
$re $amd [
$k 1
];
356 $k =
$k 2
;
357 continue ;
358 }
359 if (
$amd [
$k ]==' - '
)
360 {
361 $re =
$re -
$amd [
$k 1
] ;
362 $k =
$k 2
;
363 }
364 }
365 /* Put the calculation into the string $str */
366 $str =
$a [0
];
367 for (
$i =1;
$i <(2*
$num1 -1);
$i )
368 {
369 $str .=
$a [
$i ];
370 } 371 $result ->r1=
$re ;
372 $str =
$str ." = "
;
373 return $str ;
374 }
375
376 $r =
new Result();
377
378 /* Addition and subtraction of two numbers */
379 if ((
$num1 ==2) && (
$mul =='f') && (
$ div =='f'
))
380 {
381 $question =
fopen ("question.txt", "w"
);
382 $answer =
fopen ("answer.txt", "w"
);
383 for (
$i =0;
$i <
$num ;
$i )
384 {
385 $j =0
;
386 $bool =
true ;
387 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
388 while ((
$r ->r1)<0)
// When the result is When negative, re-random
389 {
390 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
391 }
392 while ((
$bool ) && (
$i !=0))
// Avoid duplication
393 {
394 while (
$b [
$i ]==
$b [
$j ])
395 {
396 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
397 while ((
$r ->r1)<0)
// The result is negative , re-write the question
398 {
399 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
400 }
401 $j =0
;
402 }
403 $j ;
404 if (
$j ==
$i )
405 {
406 $bool =
false ;
407 }
408 }
409 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
410 $d [
$i ]=
$b [
$i ]."n "
;
411 $e [
$i ]=
$r ->r1."n"
;
412 fwrite (
$question ,
$d [
$i ]);
413 fwrite (
$answer ,
$e [
$i ]);
414 }
415 fclose (
$question );
416 fclose (
$answer );
417 } 418
419 /* Addition, subtraction and multiplication of two numbers */
420 if ((
$num1 ==2) && (
$mul =='t') && (
$ div =='f'
))
421 {
422 $question =
fopen ("question.txt", "w"
);
423 $answer =
fopen ("answer.txt", "w"
);
424 for (
$i =0;
$i <
$num ;
$i )
425 {
426 $j =0
;
427 $bool =
true ;
428 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
429 while ((
$r ->r1)<0)
// When the result is When negative, re-random
430 {
431 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
432 }
433 while ((
$bool ) && (
$i !=0))
// Avoid duplication
434 {
435 while (
$b [
$i ]==
$b [
$j ])
436 {
437 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
438 while ((
$r ->r1)<0)
// The result is negative , re-write the question
439 {
440 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
441 }
442 $j =0
;
443 }
444 $j ;
445 if (
$j ==
$i )
446 {
447 $bool =
false ;
448 }
449 }
450 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
451 $d [
$i ]=
$b [
$i ]."n "
;
452 $e [
$i ]=
$r ->r1."n"
;
453 fwrite (
$question ,
$d [
$i ]);
454 fwrite (
$answer ,
$e [
$i ]);
455 }
456 fclose (
$question );
457 fclose (
$answer );
458 } 459
460 /* Addition, subtraction and division of two numbers */
461 if ((
$num1 ==2) && (
$mul =='f') && (
$ div =='t'
))
462 {
463 $question =
fopen ("question.txt", "w"
);
464 $answer =
fopen ("answer.txt", "w"
);
465 for (
$i =0;
$i <
$num ;
$i )
466 {
467 $j =0
;
468 $bool =
true ;
469 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
470 while ((
$r ->r1)<0)
// When the result is When negative, re-random
471 {
472 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
473 }
474 while ((
$bool ) && (
$i !=0))
// Avoid duplication
475 {
476 while (
$b [
$i ]==
$b [
$j ])
477 {
478 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
479 while ((
$r ->r1)<0)
// The result is negative , re-write the question
480 {
481 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
482 }
483 $j =0
;
484 }
485 $j ;
486 if (
$j ==
$i )
487 {
488 $bool =
false ;
489 }
490 }
491 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
492 $d [
$i ]=
$b [
$i ]."n "
;
493 $e [
$i ]=
$r ->r1."n"
;
494 fwrite (
$question ,
$d [
$i ]);
495 fwrite (
$answer ,
$e [
$i ]);
496 }
497 fclose (
$question );
498 fclose (
$answer );
499 } 500
501 /* Addition, subtraction, multiplication and division of two numbers */
502 if ((
$num1 ==2) && (
$mul =='t') && (
$ div =='t'
))
503 {
504 $question =
fopen ("question.txt", "w"
);
505 $answer =
fopen ("answer.txt", "w"
);
506 for (
$i =0;
$i <
$num ;
$i )
507 {
508 $j =0
;
509 $bool =
true ;
510 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
511 while ((
$r ->r1)<0)
// The result is negative , re-write the question
512 {
513 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
514 }
515 while ((
$bool ) && (
$i !=0))
// Judgment of duplication
516 {
517 while (
$b [
$i ]==
$b [
$j ])
518 {
519 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
520 while ((
$r ->r1)<0)
// The result is negative , re-write the question
521 {
522 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
523 }
524 $j =0
;
525 }
526 $j ;
527 if (
$j ==
$i )
528 {
529 $bool =
false ;
530 }
531 }
532 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
533 $d [
$i ]=
$b [
$i ]."n "
;
534 $e [
$i ]=
$r ->r1."n"
;
535 fwrite (
$question ,
$d [
$i ]);
536 fwrite (
$answer ,
$e [
$i ]);
537 }
538 fclose (
$question );
539 fclose (
$answer );
540 } 541
542 /* Addition and subtraction of three numbers */
543 if ((
$num1 ==3) && (
$mul =='f') && (
$ div =='f'
))
544 {
545 $question =
fopen ("question.txt", "w"
);
546 $answer =
fopen ("answer.txt", "w"
);
547 for (
$i =0;
$i <
$num ;
$i )
548 {
549 $j =0
;
550 $bool =
true ;
551 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
552 while ((
$r ->r1)<0)
// The result is negative , re-write the question
553 {
554 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
555 }
556 while ((
$bool ) && (
$i !=0))
// Judgment of duplication
557 {
558 while (
$b [
$i ]==
$b [
$j ])
559 {
560 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
561 while ((
$r ->r1)<0)
// The result is negative , re-write the question
562 {
563 $b [
$i ]= addSub(
$min ,
$max ,
$num1 ,
$r );
564 }
565 $j =0
;
566 }
567 $j ;
568 if (
$j ==
$i )
569 {
570 $bool =
false ;
571 }
572 }
573 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
574 $d [
$i ]=
$b [
$i ]."n "
;
575 $e [
$i ]=
$r ->r1."n"
;
576 fwrite (
$question ,
$d [
$i ]);
577 fwrite (
$answer ,
$e [
$i ]);
578 }
579 fclose (
$question );
580 fclose (
$answer );
581 } 582
583 /* Addition, subtraction and multiplication of three numbers */
584 if ((
$num1 ==3) && (
$mul =='t') && (
$ div =='f'
))
585 {
586 $question =
fopen ("question.txt", "w"
);
587 $answer =
fopen ("answer.txt", "w"
);
588 for (
$i =0;
$i <
$num ;
$i )
589 {
590 $j =0
;
591 $bool =
true ;
592 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
593 while ((
$r ->r1)<0)
// The result is negative , re-write the question
594 {
595 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
596 }
597 while ((
$bool ) && (
$i !=0))
// Judgment of duplication
598 {
599 while (
$b [
$i ]==
$b [
$j ])
600 {
601 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
602 while ((
$r ->r1)<0)
// The result is negative , re-write the question
603 {
604 $b [
$i ]= addSubMul(
$min ,
$max ,
$num1 ,
$r );
605 }
606 $j =0
;
607 }
608 $j ;
609 if (
$j ==
$i )
610 {
611 $bool =
false ;
612 }
613 }
614 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
615 $d [
$i ]=
$b [
$i ]."n "
;
616 $e [
$i ]=
$r ->r1."n"
;
617 fwrite (
$question ,
$d [
$i ]);
618 fwrite (
$answer ,
$e [
$i ]);
619 }
620 fclose (
$question );
621 fclose (
$answer );
622 } 623
624 /* Addition, subtraction and division of three numbers */
625 if ((
$num1 ==3) && (
$mul =='f') && (
$ div =='t'
))
626 {
627 $question =
fopen ("question.txt", "w"
);
628 $answer =
fopen ("answer.txt", "w"
);
629 for (
$i =0;
$i <
$num ;
$i )
630 {
631 $j =0
;
632 $bool =
true ;
633 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
634 while ((
$r ->r1)<0)
// The result is negative , re-write the question
635 {
636 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
637 }
638 while ((
$bool ) && (
$i !=0))
// Judgment of duplication
639 {
640 while (
$b [
$i ]==
$b [
$j ])
641 {
642 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
643 while ((
$r ->r1)<0)
// The result is negative , re-write the question
644 {
645 $b [
$i ]= addSubDiv(
$min ,
$max ,
$num1 ,
$r );
646 }
647 $j =0
;
648 }
649 $j ;
650 if (
$j ==
$i )
651 {
652 $bool =
false ;
653 }
654 }
655 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
656 $d [
$i ]=
$b [
$i ]."n "
;
657 $e [
$i ]=
$r ->r1."n"
;
658 fwrite (
$question ,
$d [
$i ]);
659 fwrite (
$answer ,
$e [
$i ]);
660 }
661 fclose (
$question );
662 fclose (
$answer );
663 } 664
665 /* Addition, subtraction, multiplication and division of three numbers */
666 if ((
$num1 ==3) && (
$mul =='t') && (
$ div =='t'
))
667 {
668 $question =
fopen ("question.txt", "w"
);
669 $answer =
fopen ("answer.txt", "w"
);
670 for (
$i =0;
$i <
$num ;
$i )
671 {
672 $j =0
;
673 $bool =
true ;
674 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
675 while ((
$r ->r1)<0)
// The result is negative , re-write the question
676 {
677 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
678 }
679 while ((
$bool ) && (
$i !=0))
// Judgment of duplication
680 {
681 while (
$b [
$i ]==
$b [
$j ])
682 {
683 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
684 while ((
$r ->r1)<0)
// The result is negative , re-write the question
685 {
686 $b [
$i ]= addSubMulDiv(
$min ,
$max ,
$num1 ,
$r );
687 }
688 $j =0
;
689 }
690 $j ;
691 if (
$j ==
$i )
692 {
693 $bool =
false ;
694 }
695 }
696 echo "( ".(
$i 1)." ) ".
$b [
$i ]."
"
;
697 $d [
$i ]=
$b [
$i ]."n "
;
698 $e [
$i ]=
$r ->r1."n"
;
699 fwrite (
$question ,
$d [
$i ]);
700 fwrite (
$answer ,
$e [
$i ]);
701 }
702 fclose (
$question );
703 fclose (
$answer );
704 }
705
706 /* Addition and subtraction of four numbers */
707 if ((
$num1 ==4) && (
$mul =='f') && (
$ div =='f'
))
708 {
709 $question =
fopen ("question.txt", "w"
);
710 $answer =
fopen ("answer.txt", "w"
);
711 for (
$i =0;
$i <
$num ;
$i )
712 {
713 $j =0
;
714 $bool =
true ;
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