cppDigitsSumVer2

#include <iostream>

int main()
{
    int number{123};

    std::cout << "Enter some three digit number to process...\n";
    std::cin >> number;

    int digitsSum{ 0 };

    digitsSum += number % 10;
    number /= 10;

    digitsSum += number % 10;
    number /= 10;

    digitsSum += number % 10;
    number /= 10;

    std::cout << "Sum of digits is " << digitsSum << '\n';
    return 0;
}