Sum Digits Algorithm
Input: 3-digit non-negative integer
Output: The sum of the digits of the given input number
1. Denote the input number by number and the output by
sum.
2. Initialization: number = 0; sum = 0.
3. Extract last digit (units) and leave the number
with two other digits
4. Add the extracted digit to the sum .
5. Extract middle digit (tens) and leave the number
with the last digit
6. Add the extracted digit to the sum .
7. Extract the first digit (hundreds) and add it to the sum .
8. Print the result.