Data members and member functions in C++ - Mini Project: Build & Apply

Data members and member functions

📖 Scenario: You are creating a simple program to manage a book's information in a library system.

🎯 Goal: Build a C++ class called Book with data members and member functions to store and display book details.

📋 What You'll Learn

Create a class named Book

Add data members title and author of type std::string

Add a member function displayInfo() that prints the book's title and author

Create an object of Book and call displayInfo()

💡 Why This Matters

🌍 Real World

Managing book information is common in library software, bookstore inventory, and reading apps.

💼 Career

Understanding classes, data members, and member functions is fundamental for software development in C++.

1

Create the Book class with data members

Create a class called Book with two public data members: title and author, both of type std::string.

C++

#include 
#include 

// Define the Book class with title and author data members

int main() {
    return 0;
}

Need a hint?

Use class Book { public: std::string title; std::string author; }; to define the class.

2

Add a member function to display book info

Inside the Book class, add a public member function called displayInfo() that prints the title and author separated by a comma and a space.

C++

#include 
#include 

class Book {
public:
    std::string title;
    std::string author;
    // Add displayInfo() member function here
};

int main() {
    return 0;
}

Need a hint?

Define void displayInfo() { std::cout << title << ", " << author << std::endl; } inside the class.

3

Create a Book object and set data members

In main(), create an object called myBook of type Book. Set myBook.title to "The Great Gatsby" and myBook.author to "F. Scott Fitzgerald".

C++

#include 
#include 

class Book {
public:
    std::string title;
    std::string author;
    void displayInfo() {
        std::cout << title << ", " << author << std::endl;
    }
};

int main() {
    // Create myBook object and set title and author
    
    // Your code here
}

Need a hint?

Use Book myBook; then assign myBook.title = "The Great Gatsby"; and myBook.author = "F. Scott Fitzgerald";.

4

Call the displayInfo() function to show book details

In main(), call the displayInfo() member function on the myBook object to print the book's title and author.

C++

#include 
#include 

class Book {
public:
    std::string title;
    std::string author;
    void displayInfo() {
        std::cout << title << ", " << author << std::endl;
    }
};

int main() {
    Book myBook;
    myBook.title = "The Great Gatsby";
    myBook.author = "F. Scott Fitzgerald";
    
    // Call displayInfo() on myBook
    
    // Your code here
    return 0;
}

Need a hint?

Call myBook.displayInfo(); to print the book details.