Why object-oriented programming is used in C++ - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a class named Car.

C++

class [1] {
public:
    int speed;
};

Drag options to blanks, or click blank then click option'

Acar

BVehicle

CCar

DSpeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or unrelated names for the class.

The class name should be Car to match the declaration.

2fill in blank

medium

Complete the code to create an object named myCar of class Car.

C++

Car [1];

Drag options to blanks, or click blank then click option'

AmyCar

Bcar1

Cspeed

DCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name instead of the object name.

The object name should be myCar as specified.

3fill in blank

hard

Fix the error in the code to access the speed attribute of myCar.

C++

myCar.[1] = 100;

Drag options to blanks, or click blank then click option'

Aspeed()

Bspeed

CSpeed

DgetSpeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase or method-like syntax for attributes.

The attribute name is speed and accessed without parentheses.

4fill in blank

hard

Fill both blanks to define a method named accelerate that increases speed by 10.

C++

void [1]() {
    speed [2] 10;
}

Drag options to blanks, or click blank then click option'

Aaccelerate

B+=

C-=

Dspeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction operator or wrong method name.

The method name is accelerate and the operator to increase speed is +=.

5fill in blank

hard

Fill all three blanks to create an object and call its accelerate method.

C++

Car [1];
[2].speed = 50;
[3]();

Drag options to blanks, or click blank then click option'

AmyCar

Daccelerate

Attempts:

3 left

💡 Hint

Common Mistakes

Using different object names or missing parentheses when calling methods.

The object is named myCar, so use it to set speed and call the method accelerate with dot notation.