// overload5.cpp		By: Aiman Hanna -  ©1993-2006 Aiman Hanna
//
// This program illustrates more of operator overloading. The program 
// shows how operators can be overloaded as a nonmember functions 
// of a class (such as free functions). Notice the difference in the 
// number of passed parameters to the overloaded function in this case. 
//
// Key Points: 		1) Operator overloading
//			2) "friend" functions
//					


#include "overload5.h"



// Free function that overloads the "+" operator. 
double operator+ (const Vehicle& vec1, const Vehicle& vec2)
{

	return vec1.price + vec2.price;
}


// Free function that overloads the "==" operator. 
bool operator== ( const Vehicle& vec1, const Vehicle& vec2 )
{

	return ((vec1.numdoors == vec2.numdoors) && (vec1.maxspeed == vec2.maxspeed) 	
		&& (vec1.price == vec2.price));

}


// Free function that increment the price of a vehicle object by the price
// of another one. Notice that this function is not a "friend" function to 
// the Vehicle class.  
void operator+= ( Vehicle& vec1, Vehicle& vec2 )
{
   
    vec1.SetPrice( vec1.GetPrice() + vec2.GetPrice());
}





Vehicle::Vehicle( int nd, double mxspd, double pr )
{
	numdoors = nd;
	maxspeed = mxspd;
	price = pr;

}




int Vehicle::GetNumDrs( void )
{
	return numdoors;
}




void Vehicle::SetNumDrs( int nd )
{
	numdoors = nd;
}




double Vehicle::GetmaxSpeed( void )
{
	return maxspeed; 
}





void Vehicle::SetMaxSpeed( double mxspd)
{
	maxspeed = mxspd;

}




double Vehicle::GetPrice( void )
{
	return price;

}



void Vehicle::SetPrice( double pr )
{
	price = pr;

}



void Vehicle::ShowInfo( void )
{
	cout << " The vehicle has " << numdoors << " doors, " << maxspeed 
	     << " KM maximum speed, and its price is " << price << "$." 
	     << endl << endl;

}




int main()
{
	Vehicle v1(2, 180, 22000), v2(3, 220, 12000);
 

	cout << "\n Here is the information of v1: " << endl;
	cout << " ============================== " << endl;
	v1.ShowInfo();

	cout << "\n Here is the information of v2: " << endl;
	cout << " ============================== " << endl;
	v2.ShowInfo();


	if (v1 == v2)	// Use the overloaded operator "==" to the two vehicles are identical
		cout << " v1 and v2 are identical objects. " << endl;
	else 
		cout << " v1 and v2 are not identical objects. " << endl;


  
	cout << "\n The total price of v1 and v2 is: " << v1 + v2  << endl;
 
 

	v1 += v2; // Use the "+=" operator to increment the price of v1 by the price of v2. 

	cout << "\n Here is the information of v1 after incrementing its price: " << endl;
	cout << " ==============================================================" << endl << endl;
	v1.ShowInfo();

	return 0;
}


// The result of running the program 
/*
 
 Here is the information of v1:
 ==============================
 The vehicle has 2 doors, 180 KM maximum speed, and its price is 22000$.


 Here is the information of v2:
 ==============================
 The vehicle has 3 doors, 220 KM maximum speed, and its price is 12000$.

 v1 and v2 are not identical objects.

 The total price of v1 and v2 is: 34000

 Here is the information of v1 after incrementing its price:
 ==============================================================

 The vehicle has 2 doors, 180 KM maximum speed, and its price is 34000$.

*/