// This program shows that a global variable is visible 
// to all the functions that appear in a program after 
// the variable's declaration.
#include <iostream>
using namespace std;

void anotherFunction(); // Function prototype
int num = 2;         // Global variable

int main()
{
   cout << "In main, num is " << num << endl;
   anotherFunction();
   cout << "Back in main, num is " << num << endl;
   return 0;
}

//*****************************************************
// Definition of anotherFunction                      *
// This function changes the value of the             *
// global variable num.                               *
//*****************************************************

void anotherFunction()
{
   cout << "In anotherFunction, num is " << num << endl;
   num = 50;
   cout << "But, it is now changed to " << num << endl;
}