Write the algorithm and code to display the sum of all the digits of a number?

The algorithm for the above requirement would be:

- The user is asked enter the number n.

- The sum and sd is set to zero at the beginning.

- Find the single digit in sd as n%10 which will give the left most digit.

- Construct the sum as sum = sum +sd

- The n is decremented by 1.

- If n is zero print the sum else repeat the loop.

The code for the above algorithm: