Procedural vs OOP approach in C++ - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a function that adds two integers.

C++

int add(int a, int b) {
    return a [1] b;
}

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A-

B/

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

The plus sign + adds two numbers together.

2fill in blank

medium

Complete the code to define a struct named Point with two integer members x and y.

C++

struct [1] {
    int x;
    int y;
};

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APoint

BCircle

CRectangle

DShape

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated names like Circle or Rectangle.

The struct is named Point to represent a point with x and y coordinates.

3fill in blank

hard

Fix the error in the class method declaration to make it a constructor.

C++

class Rectangle {
public:
    int width, height;
    [1](int w, int h) {
        width = w;
        height = h;
    }
};

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Avoid Rectangle

BRectangle

Cinit

DsetSize

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type like void to the constructor.

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

4fill in blank

hard

Fill both blanks to complete the procedural function that calculates area and the OOP method that returns area.

C++

int calculateArea(int [1], int [2]) {
    return [1] * [2];
}

class Rectangle {
public:
    int width, height;
    int area() {
        return width * height;
    }
};

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Awidth

Bheight

Clength

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using different or inconsistent parameter names.

The procedural function uses parameters width and height. The class uses member variables with the same names.

5fill in blank

hard

Fill all three blanks to complete the OOP class with constructor and method to calculate area.

C++

class Circle {
public:
    double [1];
    Circle(double [2]) {
        [1] = [2];
    }
    double area() {
        return 3.14159 * [1] * [1];
    }
};

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Aradius

Br

CradiusValue

Ddiameter

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for parameter and member without this->, causing confusion.

The member variable is radius. The constructor parameter is r. The assignment sets radius = r.