<html lang="en">
<head>
<title>PHP计算器</title>
</head>
<body>
<?php
if(!empty($_post)){
$num1=$_post['data1'];
$nam2=$_post['data2'];
$fuhao=$_post['yunsuanfu'];
if( $fuhao == '+' ){
$jieguo = $num1 + $num2;
}
else if( $fuhao == '-' ){
$jieguo = $num1 - $num2;
}
else if( $fuhao == '*' ){
$jieguo = $num1 * $num2;
}
else if( $fuhao == '/' ){
$jieguo = $num1 / $num2;
}
}
else
{
$jieguo = "";
$num1 = "";
$num2 = "";
$fuhao = "";
}
echo $jieguo ;
?>
<form action="" method="post">
<input type="text" name="data1" value="<?php echo $num1; ?>"/>
<select name="yusuanfu">
<option value = "+" <?php if($fuhao == "+"){ echo 'selected = "selected"';}?>>+</option>
<option value = "-" <?php if($fuhao == "-"){ echo 'selected = "selected"';}?>>-</option>
<option value = "*" <?php if($fuhao == "*"){ echo 'selected = "selected"';}?>>*</option>
<option value = "/" <?php if($fuhao == "/"){ echo 'selected = "selected"';}?>>/</option>
</select>
<input type= "text" name="data2" value="<?php echo $num2; ?>" />
<input type= "submit" value="=" />
<input type= "text" name="result" value="<?php echo $jieguo; ?>" />
</form>
</body>
</html>
<head>
<title>PHP计算器</title>
</head>
<body>
<?php
if(!empty($_post)){
$num1=$_post['data1'];
$nam2=$_post['data2'];
$fuhao=$_post['yunsuanfu'];
if( $fuhao == '+' ){
$jieguo = $num1 + $num2;
}
else if( $fuhao == '-' ){
$jieguo = $num1 - $num2;
}
else if( $fuhao == '*' ){
$jieguo = $num1 * $num2;
}
else if( $fuhao == '/' ){
$jieguo = $num1 / $num2;
}
}
else
{
$jieguo = "";
$num1 = "";
$num2 = "";
$fuhao = "";
}
echo $jieguo ;
?>
<form action="" method="post">
<input type="text" name="data1" value="<?php echo $num1; ?>"/>
<select name="yusuanfu">
<option value = "+" <?php if($fuhao == "+"){ echo 'selected = "selected"';}?>>+</option>
<option value = "-" <?php if($fuhao == "-"){ echo 'selected = "selected"';}?>>-</option>
<option value = "*" <?php if($fuhao == "*"){ echo 'selected = "selected"';}?>>*</option>
<option value = "/" <?php if($fuhao == "/"){ echo 'selected = "selected"';}?>>/</option>
</select>
<input type= "text" name="data2" value="<?php echo $num2; ?>" />
<input type= "submit" value="=" />
<input type= "text" name="result" value="<?php echo $jieguo; ?>" />
</form>
</body>
</html>
