<?phpheader("content-type:text/html;charset=utf-8");session_start();?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>简单计算机</title> </head> <body> <form action="jisuan.php" method="post"> 第一个数<input type="text" value="" name="num1"><br /> 计算符号<select name="oper"> <option value="+">+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select><br /> 第二个数<input type="text" value="" name="num2"><br /> <input type="submit" value="计算结果"><br /> </form> </body> </html> <?php$num1 = $_POST['num1'];$num2 = $_POST['num2'];$oper = $_POST['oper'];$rs = 0;switch ($oper) { case "+": $rs = $num1 + $num2; break; case "-": $rs = $num1 - $num2; break; case "*": $rs = $num1 * $num2; break; case "/": $rs = $num1 / $num2; break; default: echo "您输入的不正确";}$_SESSION['rs'] = $rs;echo '计算结果为：' . $_SESSION['rs'];?>
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