Scope hiding in C

问题

Does C have scope hiding?

For example, if I have a global variable:

int x = 3; 

can I 'declare' inside a function or main 'another' int x?

回答1:

Yes, that's how C works. For example:

int x;

void my_function(int x){ // this is another x, not the same one
}

void my_function2(){
  int x; //this is also another x
  {
    int x; // this is yet another x
  }
}
int main(){
  char x[5]; // another x, with a different type
}

回答2:

Yes but some compilers complain or can be told to complain. For gcc, use -Wshadow.

回答3:

Yes Scope Hiding exists in C.
A variable in local scope will hide the same named variable in global scope.

回答4:

Yes. This is very much possible. Please go through this post for a detailed explanation on various scope in C

来源：https://stackoverflow.com/questions/8928521/scope-hiding-in-c