简易的计算器

Sian · 发表于 2015-12-27 11:55:00

[PHP] 纯文本查看 复制代码

<?php
	// 是否提交动作
	if (isset($_POST['submit'])){
		$num1 = $_POST['num1'];
		$num2 = $_POST['num2'];
		$bz = true;
		$errorMsg = '存在以上问题：<br/>';
		if ($num1 == ""){
			$bz = false;
			$errorMsg = $errorMsg."第一个数不能为空<br/>";
		}else if (!is_numeric($num1)){
			$errorMsg = $errorMsg."第一个数不是数字<br/>";
			$bz = false;
		}
		if ($num2 == ""){
			$errorMsg = $errorMsg."第二个数不能为空<br/>";
			$bz = false;
		}else if (!is_numeric($num2)){
			$errorMsg = $errorMsg."第二个数不是数字<br/>";
			$bz = false;
		}
		if ($bz){
			// 标记为真则执行
			
			$result = '';
			$ysf = $_POST['ysf'];
			switch($ysf){
				case '+':{
				$result = $num1 + $num2;
				}break;
				case '-':{
				$result = $num1 - $num2;
				}break;
				case 'x':{
				$result = $num1 * $num2;
				}break;
				case '/':{
				$result = $num1 / $num2;
				}break;
				case '%':{
				$result = $num1 % $num2;
				}break;
				default:break;
			}
		
		}else{
			// 输出问题所在
			echo $errorMsg;
		}
		
		
	}else{
		echo '刷新';
	}
?>
<html>
	<head>
		<title>简单计算器</title>
	</head>
	
	<body>
		<table border="0" width="400" align="center">
			<form action="index.php" method="post">
			<caption>简单计算器</caption>
			<tr>
				<td>
					<input type="text" size="4" name="num1" align="center" value = "<?php echo $num1?>"/>
				</td>
				<td>
					<select name="ysf" value=<?php echo $ysf ?>>
						<option <?php if ($ysf == '+') echo 'selected'?> value="+">+</option>
						<option <?php if ($ysf == '-') echo 'selected'?> value="-">-</option>
						<option <?php if ($ysf == 'x') echo 'selected'?> value="x">x</option>
						<option <?php if ($ysf == '/') echo 'selected'?> value="/">/</option>
						<option <?php if ($ysf == '%') echo 'selected'?> value="%">%</option>
					</select>
				</td>
				<td>
					<input type="text" size="5" name="num2"  value = "<?php echo $num2?>"/>
				</td>
				<td>
					<input type="submit" name="submit" value="="/>
				</td>
				<td>
					<?php echo $result?>
				</td>
			</tr>
			</form>
		</table>
	</body>

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