PHP简易计算器-优快云博客

本文链接：https://blog.youkuaiyun.com/php_worker/article/details/52289716

<!doctype html>
<html>
<header>
<meta charset="utf-8">
<title>计算器</title>
</header>
<body>
<?php
 $a='';
 $b='';
 $c='';    
 $d='';
   if (isset($_POST['cala'])):
      if (empty($_POST['num1']) || empty($_POST['num2']) || !is_numeric($_POST['num1']) || !is_numeric($_POST['num2'])):
            echo '请输入数字';
        else:
         $a = $_POST['num1'];
         $b = $_POST['num2'];
         $c = $_POST['result'];
         $d = $_POST['opt'];
            switch ($d)
            {
                case '+':
                   $c=$a+$b;
                   break;
                case '-':
                   $c=$a - $b;
                   break;
                case '*':
                   $c=$a * $b;
                   break;
                case '/':
                   $c=$a / $b;
                   break;
                default:
                   break;
             }
            echo $c;       
      endif;
   endif;  
?>

<form method="post" action="" >
<hr>
<input type="text" name="num1" value="<?php echo $a ;?>" >
<select name="opt">
      <option value="+" <?php echo 'selected';?> >+</option>
      <option value="-" <?php echo 'selected';?>>-</option>
      <option value="*" <?php echo 'selected';?>>*</option>
      <option value="/" <?php echo 'selected';?>>/</option>
<input type="text" name="num2" value="<?php echo $b;?>">=
<input type="text" name="result" value="<?php echo $c; ?>">
<input type="submit" name="cala" value="计算">
<input type="button" value="刷新" onClick="reload()">
</form>
<script type="text/javascript">
     function reload()
     {
       location=location;
     }
</script>


</body>
</html>

常见试题：PHP计算器