Basic calculator for PHP, basic calculator for PHP
Design a calculation function that can complete calculations and verify unreasonable data and give error prompts.
Rule: The first number and the second number cannot be empty
If the operator is /, the second number cannot be 0.
![PHP basic calculator, PHP basic calculator_PHP tutorial]()
1 php
2 header('Content-Type: text/html; charset=utf-8'
);
3 /*Design a calculation function that can complete operations and verify unreasonable data and give error prompts.
4 Rule: The first number and the second number cannot be empty
5 If the operator is /, the second count cannot be 0.*/
6
7 function jsq(
$num1,
$oper,
$num2){
8 //The detection data cannot be empty and prompts
9 if(!
isset(
$num1) || !
is_numeric(
$num1)){
10 $error = <<<
ERROR
11 <script>
<span>12</span> alert('The first number is illegal'<span>);
</span><span>13</span> </script>
14 ERROR;
15 return $error;
16 }
17 if(!
isset(
$num2) || !
is_numeric(
$num2)){
18 $error = <<<
ERROR
19 <script>
<span>20</span> alert('The second number is illegal'<span>);
</span><span>21</span> </script>
22 ERROR;
23 return $error;
24 }
25
26 if(
$oper == "+"
){
27 $result =
$num1 +
$num2;
28 }
elseif(
$oper == "-"
){
29 $result =
$num1 -
$num2;
30 }
elseif(
$oper == "*"
){
31 $result =
$num1 *
$num2;
32 }
elseif(
$oper = "/"
){
33 if(
$num2 == 0
){
34 $error = <<<
ERROR
35 <script>
<span>36</span> alert('The second number cannot be 0'<span>);
</span><span>37</span> </script>
38 ERROR;
39 return $error;
40 }
41 $result =
$num1 /
$num2;
42 }
43 return $result;
44 }
45
46 if(
$_SERVER['REQUEST_METHOD'] == "POST"
){
47 $res = jsq(
$_POST['num1'],
$_POST['oper'],
$_POST['num2'
]);
48 }49 ?>
50
51 Basic calculator written in php
52
64 The calculated result is: echo
isset(
$res)?
$res:" "; ?>
View Code
After php obtains an expression,
analyzes and processes the expression. You can read books on data structures.
If you are just doing a simple calculator, it is to get two numbers and one operator. That would be simpler.
I don’t know how many functions your calculator needs to achieve
Based on your code, I implemented it.
You can give it a try and ask if you have any questions.
Form data transfer Please enter two numbers in the form below to find their value
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