<?php $result; $num1 = isset($_GET['num1']) ? $_GET['num1'] : 0; $num2 = isset($_GET['num2']) ? $_GET['num2'] : 0; $cal = isset($_GET['cal'])? $_GET['cal'] : 0; switch ($cal) { case '+': $result = $num1+$num2; break; case '-': $result = $num1-$num2; break; case '*': $result = $num1 * $num2; break; case '/': if ($num2 != 0) { $result = $num1 / $num2; } else { echo "被除数不可以为0"; } break; }?><!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>计算器</title></head><body> <h2>计算器</h2> <form action="" method="get"> 请输入第一个数<input type="text" name="num1" value="<?php echo $num1 ?>"><br> <input type="radio" name="cal" value="+" <?php if ($cal=="+") { echo "checked";}?>>+ <input type="radio" name="cal" value="-" <?php if ($cal=="-") { echo "checked";}?>>- <input type="radio" name="cal" value="*" <?php if ($cal=="*") { echo "checked";}?>>* <input type="radio" name="cal" value="/" <?php if ($cal=="/") { echo "checked";}?>>/<br> 请输入第二个数 <input type="text" name="num2" value="<?php echo $sum2 ?>"> <br> <button>提交</button> </form> <?php echo "<h6>$num1 {$cal} $num2 = {$result}</h6>";?></body></html>
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