Creating objects in C++ - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

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

C++

class Car {};

int main() {
    [1] myCar;
    return 0;
}

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

ACar

Bint

Cvoid

Dclass

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' or 'void' instead of the class name.

Writing 'class' before the object name.

To create an object, use the class name followed by the object name.

2fill in blank

medium

Complete the code to create an object book1 of class Book using the default constructor.

C++

class Book {
public:
    Book() {}
};

int main() {
    [1] book1;
    return 0;
}

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

Aint

Bvoid

CBook

Dclass

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' or 'void' instead of the class name.

Trying to call constructor like a function without object.

Use the class name Book to create an object book1.

3fill in blank

hard

Fix the error in creating an object circle1 of class Circle.

C++

class Circle {
public:
    Circle(double r) {}
};

int main() {
    Circle [1];
    return 0;
}

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Acircle1(5.0)

Bcircle1

Ccircle1 = Circle()

Dcircle1 = 5.0

Attempts:

3 left

💡 Hint

Common Mistakes

Not providing the required constructor argument.

Trying to assign a value without calling the constructor.

The constructor requires a double parameter. Use Circle circle1(5.0); to create the object.

4fill in blank

hard

Fill both blanks to create an object student1 of class Student using the constructor with parameters.

C++

class Student {
public:
    Student(std::string n, int a) {}
};

int main() {
    [1] [2]("Alice", 20);
    return 0;
}

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AStudent

Bstudent1

CStudent()

Dstudent1()

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses after the class name in declaration.

Using parentheses after the object name without class name.

Use the class name and object name to create the object with parameters.

5fill in blank

hard

Fill all three blanks to create an object employee1 of class Employee using the constructor with parameters.

C++

class Employee {
public:
    Employee(std::string id, double s) {}
};

int main() {
    [1] [2]([3]);
    return 0;
}

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

AEmployee

Bemployee1

C"E123", 45000

DEmployee()

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parameters or using empty parentheses.

Using parentheses after class name instead of object name.

Use the class name, object name, and provide the parameters inside parentheses.