// file count.h
#include <iostream.h>
class counter
{
public:
   counter(void);
   counter(int);
   void count(void);
   void unCount(void);
   int counterIs(void);
   void setCounter(int);
private:
   int counterValue;
};

// file count.cpp
#include "count.h"

counter::counter(void)
{
   counterValue = 0;
}

counter::counter(int initV)
{
   counterValue = initV;
}

void counter::count(void)
{
   counterValue ++;
}

void counter::unCount(void)
{
   counterValue --;
}

int counter::counterIs(void)
{
   return counterValue;
}

void counter::setCounter(int value)
{
   counterValue = value;
}

// file testCount.cpp
#include "count.h"
void main(void)
{
   counter a, b(2);

   cout << " value of counter a should be 0\n";
   cout << " value of counter a is " << a.counterIs() << endl;
   cout << " value of counter b should be 2\n";
   cout << " value of counter b is " << b.counterIs() << endl;

   cout << " now we increse the counter a by 2 ... \n";
   a.count();   // one
   a.count();   // two

   cout << " now we increse the counter b by 2 ... \n";
   b.count();   // one
   b.count();   // two

   cout << " now the value of counter a should be 2 and b should be 4\n";
   cout << " a is " << a.counterIs() << " b is " << b.counterIs() << endl;

   cout << " set counter a as -1 b as 0\n";
   a.setCounter(-1);
   b.setCounter(0);
   cout << " a value is " << a.counterIs() << "  b value is " 
         << b.counterIs() << endl; 
   cout << " test finished... \n";
}