// main0.cpp
#include "airtime0.h"

void main()
{	airtime at1, at2, at3;
	cout << "Enter first airtime: ";
	cin >> at1;
	cout << "Enter second airtime: ";
	cin >> at2;

	at3 = at1 + at2;	// overloaded + operator adds at2 to at1  
	cout << "sum = " << at3;		// display sum   

  	if (at1 < at2)		// overloaded < operator compares at1 and at2 
		cout << "\nfirst less than second\n";
	else
		cout << "\nfirst not less than second\n";

	at1 += at2;		// overloaded += operator adds at2 to at1
 	cout << "at1+=at2, at1 = " << at1;	// display result

	at3 = at1 += at2;		// do it again, use return value
	cout << "\nat3 = at1 += at2, at3 = " << at3;	// display result

	++at1;					// increment at1
	cout << "\n++at1, at1 = " << at1;	// display result      

	at2 = ++at1;				// increment again, and assign
	cout << "\nat2 = ++at1, at2 = " << at2;	// display assigned value

	at1++;					// increment at1
	cout << "\nat1++, at1 = " << at1;	// display result      

	at2 = at1++;				// increment again, and assign
	cout << "\nat2 = at1++, at2 = " << at2;	// display assigned value
	cout << ", at1 = " << at1 << endl;

	at3 = - at3;				// unary minus
	cout << "at3 = -at3, at3 = " << at3;	// display assigned value

	at3 = at1 - at2;			// subtraction operator	
	cout << "\nat3 = at1 - at2, at3 = " << at3 << endl;
}