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C++ program to demonstrate example of constructor, destructor with default arguments

Learn about the constructor and destructor with default arguments in C++, how to implement constructor, destructor with default arguments in C++ program?
[Last updated : March 02, 2023]

In this program we will learn to create constructor, destructor with default arguments in c++ programming language.

Constructor, Destructor with default arguments program in C++

// C++ program to demonstrate example of
// constructor with default arguments.

#include <iostream>
using namespace std;

class Demo {
private: //Private Data member section
    int X, Y;

public: //Public Member function section
    //Default or no argument constructor.
    Demo()
    {
        X = 0;
        Y = 0;

        cout << endl
             << "Constructor Called";
    }
    //Perameterized constructor with default argument.
    Demo(int X, int Y = 20)
    {
        this->X = X;
        this->Y = Y;

        cout << endl
             << "Constructor Called";
    }

    //Destructor called when object is destroyed
    ~Demo()
    {
        cout << endl
             << "Destructor Called" << endl;
    }
    //To print output on console
    void putValues()
    {
        cout << endl
             << "Value of X : " << X;
        cout << endl
             << "Value of Y : " << Y << endl;
    }
};

//main function : entry point of program
int main()
{
    Demo d1 = Demo(10);

    cout << endl
         << "D1 Value Are : ";
    d1.putValues();

    Demo d2 = Demo(30, 40);

    cout << endl
         << "D2 Value Are : ";
    d2.putValues();

    return 0;
}

Output

Constructor Called
D1 Value Are : 
Value of X : 10
Value of Y : 20

Constructor Called
D2 Value Are : 
Value of X : 30
Value of Y : 40

Destructor Called

Destructor Called