Classes and objects in C++ - Interactive Code Practice

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'

ASpeed

Bcar

CVehicle

DCar

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for class names.

Using unrelated names like Vehicle or Speed.

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];

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ACar

BmyCar

Ccar1

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name instead of the object name.

Using generic names like object.

The object name should be myCar as requested.

3fill in blank

hard

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

C++

myCar.[1] = 100;

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Aspeed()

BSpeed

Cspeed

DgetSpeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase attribute names.

Adding parentheses to access attributes.

The attribute name is speed and accessed without parentheses.

4fill in blank

hard

Fill both blanks to define a constructor that sets speed to 0.

C++

class Car {
public:
    int speed;
    [1] [2] {
        speed = 0;
    }
};

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ACar()

Bvoid

C()

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type like void to the constructor.

Using parentheses without braces for the body.

The constructor has the same name as the class Car() and uses braces {} for the body.

5fill in blank

hard

Fill all three blanks to create a method named accelerate that increases speed by 10.

C++

class Car {
public:
    int speed;
    void [1][2] [3] {
        speed += 10;
    }
};

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

Aaccelerate

B()

C{}

DspeedUp

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names.

Omitting parentheses or braces.

The method name is accelerate, followed by parentheses () and braces {} for the body.