Multiple constructors in a class (Overloaded Constructors)

Multiple constructors in a class (Overloaded Constructors)

When more than one constructor function defined in a class, then we say that the constructor is overloaded.

#include <iostream.h>

#include <conio.h>

class rectangle

{

   private:

      float length,breadth;

   public:

     rectangle()  //constructor declared without argument

       { length=0;

             breadth=0;

                }

   rectangle(float side) //constructor declared with one argument

              {  length=side;

                 breadth=side;

                         }

    rectangle(float l,float b)       //constructor declared with two arguments

            {       length=l;

                        breadth=b; }

            void calculateArea()

                {  cout<<"\nThe area is\t :"<<(length*breadth);  }

 };

int main()

{

   rectangle r1;    //call constructor rectangle()

   rectangle r2(10); //call constructor rectangle(float side)

   rectangle r3(10,30);//call constructor rectangle(float l, float b)

     r1.calculateArea();

     r2.calculateArea();

     r3.calculateArea();

     }

Output:

The area is       : 0

The area is       : 100

The area is       : 300