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<html>
<head>
<title>PHP实现简单的计算器</title>
<meata http-equiv="Content-Type" content="text/html;charset=utf-8"></meata>
</head>
<?php
$num1=true;
$num2=true;
$numa=true;
$numb=true;
$message="";
//单路分支
if(isset($_GET["sub"])){
if($_GET["num1"]==""){
$num1=false;
$message.="第一个数字不能为空";
}
if(!is_numeric($_GET["num1"])){
$numa=false;
$message.="第一个不是数字";
}
if($_GET["num2"]==""){
$num2=false;
$message.="第二个不能为空";
}
if(!is_numeric($_GET["num2"])){
$numb=false;
$message.="第二个不是数字";
}
if($num1 && $num2 && $numa && $numb){
$sum=0;
//多路分支swith
switch($_GET["ysf"]){
case "+":
$sum=$_GET["num1"]+$_GET["num2"];
break;
case "-":
$sum=$_GET["num1"]-$_GET["num2-"];
break;
case "x":
$sum=$_GET["num1"]*$_GET["num2"];
break;
case "/":
$sum=$_GET["num1"]/$_GET["num2"];
break;
case "%":
$sum=$_GET["num1"]%_GET["num2"];
break;
}
}
}
?>
<body>
<table align="center" border="1" sidth="500">
<caption><h1>计算器</h1></caption>
<form action="test.php">
<tr>
<td>
<input type="text" size="5" name="num1" value="<?php echo $_GET[num1] ?>"
</td>
<td>
<select name="ysf">
<option value="+" <?php if($_GET["ysf"]=="+") echo "selected" ?>>+</option>
<option value="-" <?php if($_GET["ysf"]=="-") echo "selected" ?>>-</option>
<option value="x" <?php echo $_GET["ysf"]=="x"?"selected":"" ?>>x</option>
<option value="/" <?php echo $_GET["ysf"]=="/"?"selected":"" ?>>/</option>
<option value="%" <?php echo $_GET["ysf"]=="%"?"selected":"" ?>>%</option>
</select>
</td>
<td>
<input type="text" size="5" name="num2" value="<?php echo $_GET["num2"] ?>">
</td>
<td>
<input type="submit" name="sub" value="计算">
</td>
</tr>
<?php
if(isset($_GET["sub"])){
echo '<tr><TD colspan="5">';
if($num1 && $num2 && $numa && $numb){
echo "结果:".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
}else{
echo $message;
}
echo '</td></tr>';
}
?>
</form>
</table>
</body>
</html>
/**
* Created by PhpStorm.
* User: user
* Date: 2018/3/27
* Time: 16:26
*
*/