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分享请问那位高手能帮我看看这段程序？我不知道那里出错了，可怎么也调试不成功！
<html>
<head>
<title>计算器</title>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<?php
if($out=="确定"){
if($operation=="加")
{$answer=$num1+$num2;
print("......................加".$num2."所得结果:".$answer);
}
elseif($operation=="减")
{$answer=$num1-$num2;
print("......................减".$num2."所得结果:".$answer);
}
elseif($operation=="乘")
{$answer=$num1*$num2;
print("......................乘".$num2."所得结果:".$answer);
}
else
{
if($num2==0){$answer="除数不能为零";}
else{$answer=$num1/$num2;
print(".....................除".$num2."所得结果:".$answer);
}
}
}
?>
<form action="<?php echo $PHP_SELF?>" method="POST">
操作数1:
<input type=text name=num1 value="<? echo $answer;?>">
<br>
<input type=radio name=operation value="加" checked>
加
<input type=radio name=operation value="减">
减
<input type=radio name=operation value="乘">
乘
<input type=radio name=operation value="除">
除
<br>
操作数2:
<input type=text name=num2>
<input type=submit name="out" value="确定">
<input type=reset name="out" value="清除">
</form>
</body>
</html>
<head>
<title>计算器</title>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<?php
if($out=="确定"){
if($operation=="加")
{$answer=$num1+$num2;
print("......................加".$num2."所得结果:".$answer);
}
elseif($operation=="减")
{$answer=$num1-$num2;
print("......................减".$num2."所得结果:".$answer);
}
elseif($operation=="乘")
{$answer=$num1*$num2;
print("......................乘".$num2."所得结果:".$answer);
}
else
{
if($num2==0){$answer="除数不能为零";}
else{$answer=$num1/$num2;
print(".....................除".$num2."所得结果:".$answer);
}
}
}
?>
<form action="<?php echo $PHP_SELF?>" method="POST">
操作数1:
<input type=text name=num1 value="<? echo $answer;?>">
<br>
<input type=radio name=operation value="加" checked>
加
<input type=radio name=operation value="减">
减
<input type=radio name=operation value="乘">
乘
<input type=radio name=operation value="除">
除
<br>
操作数2:
<input type=text name=num2>
<input type=submit name="out" value="确定">
<input type=reset name="out" value="清除">
</form>
</body>
</html>
...全文
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