Sum Digits

#include <iostream>
#include <string.h>
using namespace std ;
typedef long long ll ;
int main() {
    ios::sync_with_stdio(false) ; cout.tie(NULL) ; cin.tie(NULL) ;
    int n , sum = 0 ;
    cin >> n ;
    char arr[n] ;
    for (int i = 0; i < n; i++) cin >> arr[i] ;
    for (int i = 0; i != '\0'; i++) {
        sum += arr[i] ;
    }
    cout << sum ;

    return 0;
}