[教你警告消除]Warning[Pe1072]: a declaration cannot have a label！

最新推荐文章于 2023-08-25 00:24:09 发布

原创最新推荐文章于 2023-08-25 00:24:09 发布 · 5.1k 阅读

2 ·

CC 4.0 BY-SA版权

C语言专栏收录该内容

41 篇文章

订阅专栏

本文探讨了在switch-case结构中直接声明变量导致的编译错误，并提供了有效的解决方案。通过在case后面添加一对大括号来创建局部作用域，可以在不触发警告的情况下正确声明和初始化变量。

在使用switch时在case 后面申请变量会出现 error: a declaration cannot have a label 的提示

原因：Case statements are only ‘labels’. This means the compiler will interpret this as a jump directly to the label.The problem here is one of scope. Your curly brackets define the scope as everything inside the ‘switch’ statement. This means that you are left with a scope where a jump will be performed further into the code skipping the initialization. The correct way to handle this is to define a scope specific to that case statement and define your variable within it.

解决方法：在case 后面加一个{ }做相应的操作。
如下：

case STAT1:                                               
{                //双括号解除warning
uint16_t Temp;   //声明变量

if (XXXXX)  ;
break;
}
case STAT2: