// airtime0.h
// class models time data type
// overloads operators

#include <iostream.h>

class airtime
{	public:
		airtime (int h = 0, int m = 0) : hours(h), minutes(m) { }
	        airtime operator + (airtime);
		airtime operator - (airtime);
		int operator < (airtime right);
		airtime operator += (airtime right);
		airtime operator ++ ();
		airtime operator ++ (int);
		airtime operator - ();
		friend istream& operator >> (istream& , airtime& );
		friend ostream& operator << (ostream& , airtime );
	private:
      		int hours;
      		int minutes;
};