overloading constructors

	#include <iostream>
	using namespace std;
	class CRectangle {
	int x, y;
	public:
	CRectangle();
	CRectangle(int _x, int _y);
	void set_values (int,int);
	int area () {return (x*y);}
	};
	void CRectangle::set_values (int a, int b) {
	x = a;
	y = b;
	}
	CRectangle::CRectangle():x(0),y(0)
	{}
	CRectangle::CRectangle(int _x, int _y):x(_x),y(_y)
	{}
	int main () {
	CRectangle rect, rectb, rectc(3,4);
	rectb.set_values (5,6);
	cout << "rect area: " << rect.area() << endl;
	cout << "rectb area: " << rectb.area() << endl;
	cout << "rectc area: " << rectc.area() << endl;
	return 0;
	}

view raw gistfile1.cpp hosted with ❤ by GitHub

Output:

rect area: 0 rectb area: 30 rectc area: 12