Just open your c++ compiler Paste this code.
#include<iostream>
using namespace std;
class counter
{
private :
int c;
public :
counter()
{
c=0;
}
void in()
{
++c;
}
void output()
{
cout<<"First time i am doing ++  "<<c;
}

};
int main()
{
counter cr;
cr.in();
cr.output();
}