In C language

The program reads a non-negative integer and prints the sum of all the digits in the integer. The basic algorithm for this process is as follows:

While the number is not zero Add the last digit to the sum Update the number to remove the last digit 

Examples:

If the user enters 1234, the program generates the answer The digit sum is 10

If the user enters 314159, the program generates the answer The digit sum is 23

If the user enters 1001, the program generates the answer The digit sum is 2