C ++中的可变范围? [英] Variable Scope in C++?

问题描述

在c ++中，main中声明的任何变量在整个main权限中都可用吗?我的意思是，如果变量在try循环中声明，它们在整个main中是否仍可访问?因为我在main的try循环中声明了几个变量，但是如果在try循环之外的main的任何其他部分中使用它们，则会收到在此范围内未声明"错误

In c++, any variables declared in main will be available throughout main right? I mean if the variables were declared in a try loop, will they would still be accessible throughout main? Because I have declared several variables in a try loop in main, but if I use them in any other part of main outside the try loop, I get a "was not declared in this scope" error

很遗憾，我无法发布我的实际代码，但这基本上就是我正在做的事情

I unfortunately can't post my actual code but this is basically what I am doing

int main()
{
   try 
   {
     int number = 0;
   }

   catch (...)
   {
     cout <<"Error";
   }

   number ++;
   cout <<number;

   return 0;
}

我基本上会在第13和14行得到一个错误，说没有在此范围内声明数字.

I would basically get an error on line 13 and 14 saying number wasn't declared in this scope.

推荐答案

number 的范围仅限于 try 块.将该声明拉出到 main 范围，以在 try 块之后访问变量:

The scope of number is limited to the try block. Pull out this declaration to the main scope to access the variable after the try block:

int main()
{
   int number = 0;
   try 
   {
     // do something...
   }

   catch (...)
   {
     cout <<"Error";
   }

   number ++;
   cout <<number;

   return 0;
}

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