assignment 5-1-1-digit.cpp

this code is code c++. have many lesson

#include <iostream>
using namespace std;
int sumdigits(long n);

int main()
{
    long num;
    cout << "Enter Number : ";
    cin >> num;
    cout << "Sum of the digits in an integer is : " << sumdigits(num) << endl;
    system ("PAUSE");
    return 0;
}
int sumdigits(long num){
    int digits = 0,sum = 0;
    while (num > 0){
          digits = num%10;
          sum += digits;
          num = num / 10;
          }
    return sum;
}