switch 用法实例*（计算器）

第一个php页面test.php

<?php
echo "计算器";
?>

<form action="suanjieguo.php"  method="post">
<table width="100%" border="1">
  <tr>
    <td>数字1</td>
    <td><input type="text"  name="num1" /></td>
  </tr>
  <tr>
    <td>数字2</td>
    <td><input type="text"  name="num2" /></td>
  </tr>
  <tr>
    <td>运算符号</td>
    <td>
        <select name="yunsuanfu">
            <option value="+">+</option>
            <option value="-">-</option>
            <option value="*">*</option>
            <option value="/">/</option>
        </select>
    </td>
  </tr>
  <tr>
    <td colspan="2"> <input type="submit" /></td>
  </tr>
</table>
</form>

第二个页面 suanjieguo.PHP

<?php

$num1=$_REQUEST[num1];
$num2=$_REQUEST[num2];
$yunsuanfu=$_REQUEST[yunsuanfu];

switch($yunsuanfu){
        case "+";
            echo  "$num1 + $num2 = ";
            echo  $num1+$num2 ;
            break;
        case "-";
            echo  "$num1 - $num2 = ";
            echo  $num1-$num2 ;
            break;
        case "*";
            echo  "$num1 * $num2 = ";
            echo  $num1*$num2 ;
            break;
        case "/";
            echo  "$num1 / $num2 = ";
            echo  $num1/$num2 ;
            break;

        default;
            echo "无法计算";
            break;

    }

?>


<br />
<a href="test.php">返回</a>