giúp mình bài này với ạ

var
    input, output: Text;
    k, s: Int64;
begin
    assign(input, 'WHILE10.INP');
    assign(output, 'WHILE10.out');
    reset(input);
    rewrite(output);
    readln(input, k);
    s := 0;
    while k <> 0 do
    begin
        s := s + k mod 10;
        k := k div 10;
    end;
    writeln(output, s);
    close(input);
    close(output);
end.

#include <bits/stdc++.h>
using namespace std;

int main()
{
    freopen("WHILE10.inp","r",stdin);
    freopen("WHILE10.out","w",stdout);
    long long so,soTemp,tong=0;
    cin >> so;
    soTemp = so;
    while (soTemp != 0) {
        tong += soTemp % 10;
        soTemp /= 10;
    }
    cout<<tong;
    return 0;
}

//xin AD vote 5 sao^^