Can we declare a variable out of the main() and out of any function?

Question

I mean right after incuding <iostream>, using namespace std and befor main() and then use it in main or in any other function.

Answer 1

yes you can, in case of outside declaration the variable will be accessible from all other functions, in case of inside declaration it will be accessible only in particular function

Answer 2

yes, That is called global variable

Answer 3

Yes. This is a global variable.

Answer 4

// C++
#include <iostream>
using namespace std;

// Global variable declaration:
int g = 20;

int main () {

cout << "Global var = " << g << " \n";

// Local variable declaration:
int g = 10;
cout << "Local var = " << g;

return 0;
}

output :
Global var = 20
Local var = 10