<?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 $sum2 ?>"><br><button>提交</button></form><?phpecho "<h6>$num1 {$cal} $num2 = {$result}</h6>";?></body></html>
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