Write a program that prompts the user to enter an integer number between 0 and 1000 and adds all the digits in the integer. For example, if an integer is 932, the sum of all its digits is 14.

Hint: Use the % operator to extract digits, and use the / operator to remove the extracted digit. For instance, 932%10 is 2 and 932/10 is 93.

Here is a sample run:

Enter an integer number between 0 and 1000: 999

The sum of the digits is 27.