Example: Calculate Area and Perimeter of a Rectangle in C

// Calculate Area and Perimeter of a Rectangle
#include <stdio.h>

int main() {
    // Step 1: Declare variables to store length, width, area, and perimeter.
    // Using float for dimensions allows for non-integer values.
    float length, width, area, 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 entered by 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 entered by 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.
    // "%.2f" formats the float to two decimal places.
    printf("Area of the rectangle: %.2f square units\n", area);
    // Step 9: Display the calculated perimeter.
    printf("Perimeter of the rectangle: %.2f units\n", perimeter);

    return 0;
}