//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;
}