这个问题出在那里？
<body><br /><form action="index.php" method="post"><br />输入A：<input type="text" name="c"/><br><br />输入B：<input type="text" name="d"/><br /><input type="submit" value="Submit"/><br /></form><br /><?php<br /> function jisuan(&$a,&$b){<br /> $c=$a+$b;<br /> echo 'a+b='.$c."<br/>";<br /> }<br /> if(isset($_POST['c']) && isset($_POST['d']))<br /> {<br /> $x=$_POST['c'];<br /> $y=$_POST['d'];<br /> jisuan($x,$y);<br /> }<br /> else <br /> echo "结果为0！";<br />?><br /></body><?php<br /> function jisuan(&$a,&$b){<br /> $c=$a+$b;<br /> echo 'a+b='.$c."<br/>";<br /> }<br /> if(isset($_POST['c']) && isset($_POST['d']))<br /> {<br /> $x=$_POST['c'];<br /> $y=$_POST['d'];<br /> jisuan($x,$y);<br /> }<br /> else <br /> echo "结果为0！";<br />?>
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