Example: Calculate Area and Perimeter of a Rectangle in C

// Calculate Area and Perimeter of a Rectangle
#include <stdio.h> // Required for input/output functions

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

    // Step 2: Prompt the user to enter the length of the rectangle.
    printf("Enter the length of the rectangle: ");
    // Step 3: Read the length value from the user.
    scanf("%f", &length);

    // Step 4: Prompt the user to enter the width of the rectangle.
    printf("Enter the width of the rectangle: ");
    // Step 5: Read the width value from the user.
    scanf("%f", &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 and perimeter to the user.
    // %.2f formats the float to two decimal places.
    printf("\nArea of the rectangle: %.2f square units\n", area);
    printf("Perimeter of the rectangle: %.2f units\n", perimeter);

    return 0; // Indicate successful program execution
}