//**************************************************************
//                                                                    
//  Class:			Bus class (Labtest Thursday, 1:00)                 
//                                                                     
//  Authors:		Art Miller		amiller@mta.ca
//					Bob Rosebrugh	rrosebrugh@mta.ca
//                                                                    
//  Description:	A class for bus objects
//						
//	METHODS:
//		Bus					a constructor  
//		busEmpty			is the busEmpty?
//		addPassengers		add passengers
//		removePassengers	remove passengers
//		displayBus			display the bus	
//
//  Date:			November 18, 1999 
//
//  Course Info:	CS 1711, Lab test4  1:00, Thursday, Nov 18, 1999, 
//
//  Filename:		bus.h 
//                                                                    
//***************************************************************

const int MAXCAPACITY = 50;
const int START       = 30;
class Bus
{
	private:
		//  passengers on the bus & capcity of the bus.
		int passengers;
		int capacity;
	public:
		// initialize passengers to 20, capacity to MAXCAPACITY	
		Bus();  
	  	bool busEmpty();        // is the bus empty ?
		void addPassengers (int newpassengers);		// add passengers
		void removePassengers(int oldpassengers);   // remove passengers
		void displayBus ();		// displays the number of passengers on the bus.
};
// *******************************
//      Bus class implementation
// *******************************

// initialize Bus
Bus::Bus()
{	passengers = START;
	capacity = MAXCAPACITY;
}


// return whether the bus is empty
bool Bus::busEmpty()		 
{	
	return (passengers <= 0);
}

void Bus::addPassengers (int newpassengers)		
{	
	passengers = passengers + newpassengers;
	if (passengers >= capacity) 
		passengers = capacity;
}

void Bus::removePassengers(int oldpassengers)	// remove passengers
{	
	passengers = passengers - oldpassengers;
	if (passengers <= 0)
		passengers = 0;

}

void Bus::displayBus()
{
	if (passengers <= 0)
		cout << "The bus is empty!"<< endl;
	else if (passengers >= capacity)
		cout << "The bus is full !"<< endl;
	else
		cout << "Passengers = " << passengers << endl;
}