Answer to Question #323889 in C++ for khan

Question

We want to create a class of Product that contains multiple private data members such as

 quantity: An integer that holds a count value.

 objCount: A static integer that holds that count of objects.

 serialNo: An integer that holds the serial number of objects of a specific product (assume

the single object of Product class).

 Define a constructor that can accept two arguments i.e., totalQuantityOfProduct and

serialNumberOfProduct; and assign it to the respective data members of the class.

Moreover, the static member be shall be initialized from the outside of the class with zero

by using scope resolution operator.

 Define operator = that add the value of quantity to the left hand operand. i.e. c2=c1 (the

quantity of object c2 shall be incremented with the quantity of c1).

 Define unary operator - that inverts the value of quantity for product class and should

allow the statements like c1 -= 4;

 Execute the provided testCases.

Answer 1

#include <iostream>

using namespace std;

class Product
{
	int quantity;
	static int Objcount;
	int serialNo;
public:
	Product():quantity(0), serialNo(0){ ObjIncrement(); }
	Product(int totalQuantityOfProduct, int serialNumberOfProduct)
	:quantity(totalQuantityOfProduct), serialNo(serialNumberOfProduct)
	{
		ObjIncrement();
	}

	Product(Product& p)
	{
		quantity = p.quantity;
		serialNo = p.serialNo;
		ObjIncrement();
	}
	Product& operator= (Product& p)
	{
		quantity = p.quantity;
		serialNo = p.serialNo;
		return *this;
	}
	Product& operator-= (int value)
	{
		quantity -= value;
		return *this;
	}
	static void ObjIncrement() { Objcount++; }
	void Display()
	{
		cout << "\nProduct quantity: " << quantity
			<< "\nProduct serialNo: " << serialNo
			<< "\nProduct Objcount:" << Objcount;
	}
};

int Product::Objcount = 0;

int main()
{
	Product a(5, 123456789);
	a.Display();
	Product b = a;
	b.Display();
	b -= 3;
	b.Display();
}