C++ Program for multiple constructors.

 Objective: Write a C++ Program to design a class of multiple constructors.

Code:

#include <iostream>

#include <string>

using namespace std;

class Book 

{

private:

    string title;

    string author;

    int publicationYear;

public:

    // Default constructor

    Book() 

    {

        title = "Unknown";

        author = "Unknown";

        publicationYear = 0;

    }

    // Parameterized constructor with title and author

    Book(const string& t, const string& a) 

    {

        title = t;

        author = a;

        publicationYear = 0;

    }

    // Parameterized constructor with title, author, and publication year

    Book(const string& t, const string& a, int y) 

    {

        title = t;

        author = a;

        publicationYear = y;

    }

    // Function to display book details

    void display() const 

{

        cout << "Title: " << title << endl;

        cout << "Author: " << author << endl;

        cout << "Publication Year: " << publicationYear << endl;

    }

};

int main() 

{

    // Create objects using different constructors

    // Using the default constructor

    Book book1;

    cout << "Book 1 Details:" << endl;

    book1.display();

    // Using the constructor with title and author

    Book book2("2017", "Web Tech-1");

    cout << "\nBook 2 Details:" << endl;

    book2.display();

    // Using the constructor with title, author, and publication year

    Book book3("Web Tech-2", "G Krishna", 2018);

    cout << "\nBook 3 Details:" << endl;

    book3.display();

    return 0;

}

Output: