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php+html 实现加减乘除

2016-04-02 12:43 459 查看

首先创建一个.php的文档

<HTML>
<HEAD>
<TITLE>表单数据传递</TITLE>
</HEAD>
<BODY>
<?php
if (isset($_POST["tag"])){
$addend1=$_POST["addend1"];
$addend2=$_POST["addend2"];
$method =$_POST['method'];
}else{
$addend1=0;
$addend2=0;
$method ='+';
}

switch ($method){
case '+':
$result = $addend1 + $addend2;
break;
case '-':
$result = $addend1 - $addend2;
break;
case 'x':
$result = $addend1 * $addend2;
break;
case '/':
$addend2 = $addend2 == 0? 1: $addend2;
$result = $addend1 / $addend2;
break;
case '%':
$addend2 = $addend2 == 0? 1: $addend2;
$result = $addend1 % $addend2;
break;
default:
$method ='+';
$result = $addend1 + $addend2;
}
?>
<meta charset="utf-8">
<form name="form1" method="post" action="#">

<input type="hidden" name="tag" size="4" value="1">
<input type="text" name="addend1" size="4" value="<?php echo $addend1;?>">
<select name="method">
<option value='+'<?php if($method=='+')echo " selected='selected'";?>>+</option>
<option value='-'<?php if($method=='-')echo " selected='selected'";?>>-</option>
<option value='x'<?php if($method=='x')echo " selected='selected'";?>>x</option>
<option value='/'<?php if($method=='/')echo " selected='selected'";?>>/</option>
<option value='%'<?php if($method=='%')echo " selected='selected'";?>>%</option>
</select>
<input type="text" name="addend2" size="4" value="<?php echo $addend2;?>">
=
<?php echo $result;?><br>
<br><input type="submit" name="button1" value="计算">
</form>
</BODY>
</HTML>

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