C++ Program: [Switch] Area Calculation: Circle, Square, Rectangle using switch statement

Write a Simple program in C++ to calculate the area of Circle, Square, and Rectangle using switch statement.

#include <iostream>
using namespace std;

int main() {
    int choice;
    float radius, side, length, width, area;

    cout << "Choose a shape to calculate its area:" << endl;
    cout << "1. Circle" << endl;
    cout << "2. Square" << endl;
    cout << "3. Rectangle" << endl;
    cin >> choice;

    switch(choice) {
        case 1:
            cout << "Enter the radius of the circle: ";
            cin >> radius;
            area = 3.14159 * radius * radius;
            cout << "Area of the circle: " << area << endl;
            break;

        case 2:
            cout << "Enter the side length of the square: ";
            cin >> side;
            area = side * side;
            cout << "Area of the square: " << area << endl;
            break;

        case 3:
            cout << "Enter the length and width of the rectangle: ";
            cin >> length >> width;
            area = length * width;
            cout << "Area of the rectangle: " << area << endl;
            break;

        default:
            cout << "Invalid choice." << endl;
    }

    return 0;
}

#include <iostream>

using namespace std;

int main() {

int choice;

float radius, side, length, width, area;

cout << "Choose a shape to calculate its area:" << endl;

cout << "1. Circle" << endl;

cout << "2. Square" << endl;

cout << "3. Rectangle" << endl;

cin >> choice;

switch(choice) {

case 1:

cout << "Enter the radius of the circle: ";

cin >> radius;

area = 3.14159 * radius * radius;

cout << "Area of the circle: " << area << endl;

break;

case 2:

cout << "Enter the side length of the square: ";

cin >> side;

area = side * side;

cout << "Area of the square: " << area << endl;

break;

case 3:

cout << "Enter the length and width of the rectangle: ";

cin >> length >> width;

area = length * width;

cout << "Area of the rectangle: " << area << endl;

break;

default:

cout << "Invalid choice." << endl;

}

return 0;

}

Possible Outputs:

Output#1 Choosing Circle:

Choose a shape to calculate its area: 1. Circle 2. Square 3. Rectangle 1 Enter the radius of the circle: 5 Area of the circle: 78.5398

Output#2 Choosing Square:

Choose a shape to calculate its area: 1. Circle 2. Square 3. Rectangle 2 Enter the side length of the square: 7 Area of the square: 49

Output#3 Choosing Rectangle:

Choose a shape to calculate its area: 1. Circle 2. Square 3. Rectangle 3 Enter the length and width of the rectangle: 4 9 Area of the rectangle: 36

Output#4 Invalid Choice (e.g., selecting option 4):

Choose a shape to calculate its area: 1. Circle 2. Square 3. Rectangle 4 Invalid choice.

C++ Program: [Switch] Area Calculation: Circle, Square, Rectangle using switch statement
By: Prof. Dr. Fazal Rehman | Last updated: July 25, 2024

Possible Outputs:

Output#1 Choosing Circle:

Output#2 Choosing Square:

Output#3 Choosing Rectangle:

Output#4 Invalid Choice (e.g., selecting option 4):

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