각 자리 숫자 더하기

#include <iostream>
#include <string>
using namespace std;
int main(void) {
 string number;
 cout << " number input >>> ";
 cin >> number;
 int number_data = 0;
 int sum = 0;
 for (int i = 0; i < int(number.length()); i++) {
  number_data = int(number[i])-48;
  cout << number_data << endl;
  sum += number_data;
 }
 cout <<"sum = >"<< sum << endl;;
 return 0;
}