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C++ program to demonstrate example of Constructor Overloading

Learn about the Constructor Overloading in C++, how to implement Constructor Overloading in C++ program?
[Last updated : March 02, 2023]

In this program we will learn to create Constructor Overloading program in c++ programming language.

Constructor Overloading Program in C++

// C++ program to demonstrate example of
// Constructor Overloading

#include <iostream>
using namespace std;

//Class declaration.
class Demo {
    //Private block to declare data member( X,Y )
    //of integer type.
private:
    int X;
    int Y;

    //Public blocks of member function to
    //access data members.
public:
    //Declaration of default constructor to
    //initialize data members.
    Demo();

    //Declaration of parameterized constructor to
    //initialize data members.
    Demo(int a, int b);
    //To display output onn screen.
    void Display();

}; //End of class

//Definition of parameterized constructor.
Demo::Demo()
{
    X = 10;
    Y = 20;
}

//Definition of parameterized constructor.
Demo::Demo(int a, int b)
{
    X = a;
    Y = b;
}

//Definition of Display() member function.
void Demo::Display()
{
    cout << endl
         << "X: " << X;
    cout << endl
         << "Y: " << Y << endl;
}

int main()
{
    Demo d1;
    cout << "Default Constructor: " << endl;
    cout << "Value after initialization : ";
    d1.Display();

    //Ctor automatically call when object is created.
    Demo d2(30, 40);
    cout << "Parameterized Constructor: " << endl;
    cout << "Value after initialization : ";
    d2.Display();

    return 0;
}

Output

Default Constructor: 
Value after initialization: 
X: 10
Y: 20
Parameterized Constructor: 
Value after initialization: 
X: 30
Y: 40