Question

the question is can we call variable A “global variable”? From the one hand A is static global variable, so it is global by definition, from the other global variable must be available in every point of your program, not only in the current translation unit. Thanks.

#include<stdio.h>

static int A;

void main()
{
    ...
}

Answer 1

No, a static is not a global because it has internal linkeage. A copy will exist for each TU that defines it.

From the one hand A is static global variable, so it is global by definition

Why is it a static global variable? It’s static, yes, but that’s about it.

Global variables in C++ are those declared extern and defined only once, or contained as static members (which has a whole different meaning).