Default constructor in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a default constructor for class Car.

C++

class Car {
public:
    [1]() {}
};

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Avoid

B~Car

CCar

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using a return type like void or int for the constructor.

Using the destructor name (~Car) instead of the constructor.

The default constructor has the same name as the class and no return type.

2fill in blank

medium

Complete the code to create an object car1 using the default constructor.

C++

Car [1];

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Acar1()

Bcar1

CCar

DCar()

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses after the object name like car1().

Trying to call the class name instead of the object name.

To create an object with the default constructor, just declare the object name.

3fill in blank

hard

Fix the error in the default constructor declaration.

C++

class Bike {
public:
    [1]() {}
};

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

Avoid

B~Bike

Cint

DBike

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type to the constructor.

Using the destructor name instead of the constructor.

Constructors should not have a return type like void.

4fill in blank

hard

Fill both blanks to define a default constructor that sets wheels to 4.

C++

class Vehicle {
public:
    int wheels;
    [1]() {
        wheels [2] 4;
    }
};

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

AVehicle

Bwheels

C=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '=' for assignment.

Using a different name than the class for the constructor.

The constructor name matches the class name, and the assignment operator '=' sets wheels to 4.

5fill in blank

hard

Fill all three blanks to create a default constructor that initializes brand and sets speed to 0.

C++

class Bike {
public:
    std::string [1];
    int [2];
    [3]() {
        brand = "Yamaha";
        speed = 0;
    }
};

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

Abrand

Bspeed

CBike

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' as a return type for the constructor.

Mixing up variable names or constructor name.

Member variables brand and speed are declared, and the constructor named Bike initializes them.