C++ Program On Constructor Overloading-Calculate Area Of Rectangle

This is a sample C++ program on Constructor Overloading. Using Constructor Overloading, here we calculate area of rectangles with default values.


#include <iostream.h>
#include <conio.h>

class rectangle
{
    private:
       int length, breadth;

    public:

       rectangle ( )
        {
            length = breadth = 0;
            cout<<"Constructor With Zero Parameter Called.\n";
        }

       rectangle (int a)
        {
            length = breadth = a;
            cout<<"Constructor With One Parameter Called. \n";
        }

       rectangle (int a, int b)
        {
            length = a; breadth = b;
            cout<<"Constructor With Two Parameters Called. \n";
        }

       int area ( )
        {
            return (length*breadth);
        }

};


int main ( )
{
    clrscr ( );
    rectangle r1;
    rectangle r2 (10);
    rectangle r3 (10, 15);

    cout<<"\n Area Of First Rectangle = "<<r1.area ( );
    cout<<"\n Area Of Square = "<<r2.area ( );
    cout<<"\n Area Of Second Rectangle = "<<r3.area ( );
    getch();
    return 0;
}


OUTPUT:

Constructor With Zero Parameter Called.
Constructor With One Parameter Called.
Constructor With Two Parameters Called.

Area Of First Rectangle = 0
Area Of Square = 100
Area Of Second Rectangle = 150