Getter and setter methods in C++ - Mini Project: Build & Apply

Getter and Setter Methods in C++

📖 Scenario: You are creating a simple program to manage a Car object. The car has a speed attribute that you want to control carefully. You will use getter and setter methods to safely access and update the speed.

🎯 Goal: Build a C++ class called Car with a private speed variable. Create getter and setter methods to read and update the speed. Use these methods to set the speed to 60 and then print it.

📋 What You'll Learn

Create a class named Car with a private integer variable speed

Add a public getter method getSpeed() that returns the current speed

Add a public setter method setSpeed(int s) that sets the speed to s

In main(), create an object of Car, set the speed to 60 using the setter, and print the speed using the getter

💡 Why This Matters

🌍 Real World

Getter and setter methods are used in real-world programs to protect data inside objects and control how it is accessed or changed.

💼 Career

Understanding getters and setters is important for writing clean, safe, and maintainable code in many programming jobs involving object-oriented programming.

1

Create the Car class with a private speed variable

Write a class called Car with a private integer variable named speed. Do not add any methods yet.

C++

class Car {
private:
    int speed;
};

int main() {
    return 0;
}

// Your code here

Need a hint?

Use the class keyword to define the class. Declare speed under private:.

2

Add getter and setter methods to the Car class

Inside the Car class, add a public getter method named getSpeed() that returns an int, and a public setter method named setSpeed(int s) that sets the private speed variable to s.

C++

class Car {
private:
    int speed;
public:
    // Add getter method getSpeed() here
    // Add setter method setSpeed(int s) here
};

int main() {
    return 0;
}

// Your code here

Need a hint?

Put the getter and setter methods under public:. The getter returns speed. The setter takes an int s and assigns it to speed.

3

Create a Car object and set the speed

In the main() function, create an object named myCar of type Car. Use the setter method setSpeed(60) on myCar to set the speed to 60.

C++

class Car {
private:
    int speed;
public:
    int getSpeed() {
        return speed;
    }
    void setSpeed(int s) {
        speed = s;
    }
};

int main() {
    Car myCar;
    // Use setSpeed(60) on myCar here
    return 0;
}

// Your code here

Need a hint?

Create the object with Car myCar;. Call the setter with myCar.setSpeed(60);.

4

Print the speed using the getter method

In main(), after setting the speed, print the speed using std::cout and the getter method getSpeed() on myCar. Include #include <iostream> and use std::endl to end the line.

C++

#include 

class Car {
private:
    int speed;
public:
    int getSpeed() {
        return speed;
    }
    void setSpeed(int s) {
        speed = s;
    }
};

int main() {
    Car myCar;
    myCar.setSpeed(60);
    // Print the speed using std::cout and getSpeed() here
    return 0;
}

// Your code here

Need a hint?

Use std::cout << myCar.getSpeed() << std::endl; to print the speed.