(sum the digits in an integer)

Write a C++ program that prompts the user to enter an integer and displays the sum of all its digits using a C++ function that computes the sum of the digits in an integer. The following function header should be used:

int sumDigits(long n)

For example, sumDigits(234) returns 9(2+3+4). (Hint: Use the % operator to extract digits and the / operator to remove the extracted digit. For instance, to extract 4 form 234, use 234%10 (=4). To remove 4 from 234 use 234/10 (=23). Use a loop to repeatedly extract and remove the digit until all the digits are extracted.