$($Sum the digits of an integer$)$ Write a C$++$ program that reads in an integer between $0$ and

$1000$ and adds all the digits in the integer. For example, if an integer is $932,$ the sum

of its digits is $9+3+2=14.$

Hint: use the $\%$ operator to extract digits, and the $/$ operator to remove the extracted

digit. For instance, $932\%10=2$ and $932/10=93.$

Here is a sample run: