// Filename:   Timer.h
//
#ifndef _Timer
#define _Timer
// Timer class: provides a countdown timer with minutes and seconds
// timer does not go less than zero
//
// Construction: 
//    a) a positive integer initializer specifies the number of minutes
//           and seconds
//    b) no initializer; timer set to zero
// ******************** Public Operations *********************
// void set(int minutes, int seconds)
//                       --> resets timer to minutes and possibly seconds
// void print(ostream &os) const
//                       --> prints minutes:seconds remaining to os
// ostream & operator << (ostream & os, const Timer & t)
//                       --> prints minutes:seconds remaining to os
// void subtract(int minutes, int seconds)
//                       --> subtracts minutes and seconds from timer
// int outOfTime( )      --> returns 1 if timer has run out, 0 otherwise
// By David Hutchens and Beth Katz

#include <iostream>

class Timer
{
public:
   Timer(int minutes=0, int seconds=0);
   virtual void set(int minutes=0, int seconds=0);
   virtual void print(std::ostream & os) const;
   virtual void subtract(int minutes, int seconds);
   virtual int outOfTime( ) const;
private:
   int theSeconds;
};

std::ostream & operator << (std::ostream & os, const Timer & t);

#endif