具有相同名称的变量声明C ++ [英] variables declaration with same name C++

问题描述

可以吗?

Class A{
...
...
};

A a; //Global object

int main()
{
   A a; // Local object
   .
   .
   .
   .
   return 0;
}

在类定义之后已声明了全局对象，但还声明了局部变量.可以吗为什么?

Here a global object has been declared after the class definition, but also a local variable has been declared. Is it ok? Why?

推荐答案

隐藏"对象的声明和另一个声明在更严格的范围内是完全合法的.在您的 main 函数中， a 将引用局部变量.在 main 函数之外， a 将引用全局变量.

It's perfectly legal to "hide" the declaration of an object, with another declaration in tighter scope. Within your main function, a will refer to the local variable. Outside the main function, a will refer to the global variable.

关于是否可以-我要说不".这是一个坏主意，因为这可能会使您的代码混乱，并且更容易意外引入错误.我不建议这样做.

As to whether it's "ok" - I would say "no". It's a bad idea, in that it's likely to make your code confusing, and more prone to accidentally introducing bugs. I wouldn't advise doing it.

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