#include<iostream>
using namespace std;
int gVar =100;
void increase()
{
	gVar=gVar+1;
}
void decrease()
{
	gVar=gVar-1;
}
int main()

{
	cout<<"Value of gVar="<<gVar;
	increase();
	cout<<"\nafter increased, gVar="<<gVar;
	decrease();
	cout<<"\nAfter decreased,gVar="<<gVar;
}