Example: Sum of Squares of Digits in C

// Sum of Squares of Digits
    #include <stdio.h>

    int main() {
        // Step 1: Declare variables
        int number;
        int sum_of_squares = 0;
        int digit;

        // Step 2: Prompt user for input
        printf("Enter an integer: ");
        scanf("%d", &number);

        // Store the original number for display later
        int original_number = number;

        // Step 3: Handle negative numbers by converting to positive for digit processing
        if (number < 0) {
            number = -number;
        }

        // Step 4: Loop to extract digits and calculate sum of squares
        while (number > 0) {
            // Extract the last digit
            digit = number % 10;

            // Square the digit and add to the sum
            sum_of_squares += digit * digit;

            // Remove the last digit from the number
            number /= 10;
        }

        // Step 5: Display the result
        printf("The sum of the squares of the digits of %d is: %d\n", original_number, sum_of_squares);

        return 0;
    }