global variables across functions : block scope variable « Language Basics « C++ Tutorial

1. C++ Tutorial
2. Language Basics
3. block scope variable

#include <iostream>

using namespace std;

int glob = 10;  // global variable

void access_global();
void hide_global();
void change_global();

int main()
{
    cout << "In main() glob is: " << glob << "\n\n";
    access_global();

    hide_global();
    cout << "In main() glob is: " << glob << "\n\n";

    change_global();
    cout << "In main() glob is: " << glob << "\n\n";

    return 0;
}

void access_global()
{
    cout << "In access_global() glob is: " << glob << "\n\n";
}

void hide_global()
{
    int glob = 0;  // hide global variable glob
    cout << "In hide_global() glob is: " << glob << "\n\n";
}

void change_global()
{
    glob = -10;  // change global variable glob
    cout << "In change_global() glob is: " << glob << "\n\n";
}