Example: Rectangle Area and Perimeter Calculator in C++

// Rectangle Area and Perimeter Calculator
#include <iostream> // Required for input/output operations

int main() {
    // Step 1: Declare variables to store length, width, area, and perimeter.
    // Using 'double' for dimensions allows for non-integer values.
    double length, width, area, perimeter;

    // Step 2: Prompt the user to enter the length of the rectangle.
    std::cout << "Enter the length of the rectangle: ";
    // Step 3: Read the length entered by the user.
    std::cin >> length;

    // Step 4: Prompt the user to enter the width of the rectangle.
    std::cout << "Enter the width of the rectangle: ";
    // Step 5: Read the width entered by the user.
    std::cin >> width;

    // Step 6: Calculate the area of the rectangle.
    // Formula: Area = length * width
    area = length * width;

    // Step 7: Calculate the perimeter of the rectangle.
    // Formula: Perimeter = 2 * (length + width)
    perimeter = 2 * (length + width);

    // Step 8: Display the calculated area to the user.
    std::cout << "The Area of the rectangle is: " << area << std::endl;
    // Step 9: Display the calculated perimeter to the user.
    std::cout << "The Perimeter of the rectangle is: " << perimeter << std::endl;

    return 0; // Indicate successful program execution
}