<?php
/**
* Created by PhpStorm.
* User: ITAK
* Date: 2017/3/3
* Time: 10:28
*/
error_reporting(E_ALL & ~E_NOTICE);
if(isset($_POST['submit'])){
$ok = true;
$error = "出现的问题：<br>";
if($_POST['num1'] == ""){
$ok = false;
$error = $error."第一个数字不能为空<br>";
}
else{
if(!is_numeric($_POST['num1'])){
$ok = false;
$error = $error."第一个数字不是数字<br>";
}
}
if($_POST['num2'] == ""){
$ok = false;
$error = $error."第二个数字不能为空<br>";
}
else{
if(!is_numeric($_POST['num2'])){
$ok = false;
$error = $error."第二个数字不是数字<br>";
}
}
}
if($ok){
$sum = "";
$fuhao = $_POST['fuhao'];
if($fuhao == '+')
$sum = $_POST['num1'] + $_POST['num2'];
if($fuhao == '-')
$sum = $_POST['num1'] - $_POST['num2'];
if($fuhao == '*')
$sum = $_POST['num1'] * $_POST['num2'];
if($fuhao == '/')
$sum = $_POST['num1'] / $_POST['num2'];
if($fuhao == '%')
$sum = $_POST['num1'] % $_POST['num2'];
}
echo "<br>";
?>
<html>
<head>
<meta charset="UTF-8">
<title>简单计算器</title>
</head>
<body>
<table border="0" width="400" align="center">
<form action="cal.php" method="post">
<caption><h1>简单计算器</h1></caption>
<tr>
<td>
<input type="text" size="5" name="num1" value="<?php echo $_POST['num1'] ?>"/>
</td>
<td>
<select name="fuhao">//下拉列表
<option <?php if($_POST['fuhao']=="+") echo "selected"?>
value="+"> + </option>
<option <?php if($_POST['fuhao']=="-") echo "selected"?>
value="-"> - </option>
<option <?php if($_POST['fuhao']=="*") echo "selected"?>
value="*"> * </option>
<option <?php if($_POST['fuhao']=="/") echo "selected"?>
value="/"> / </option>
<option <?php if($_POST['fuhao']=="%") echo "selected"?>
value="%"> % </option>
</select>
</td>
<td>
<input type="text" name="num2" size="5" value="<?php echo $_POST['num2'] ?>"/>
</td>
<td>
=
</td>
<td>
<input type="text" name="res" size="5" value="<?php echo $sum ?>"/>
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="计算" name="submit">
</td>
</tr>
<br>
<tr>
<td colspan="4">
<?php
if($ok){
echo "结果为: {$_POST['num1']} {$_POST['fuhao']} {$_POST['num2']} = {$sum}";}
else{
echo $error;}
?>
</td>
</tr>
</form>
</table>
</body>
</html>
