OSTSIL - Ostania niezerowa cyfra silni

// Spojek.cpp : Defines the entry point for the console applicatio
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>
#include <time.h>

using namespace std;

void otsil()
{
    char numer[4];
    int r = 0;
    int n;
    int w = 1;
    cin >> n;
    for (int j = 1; j <= n; j++) {
        w *= j;
    }
    while (w % 10 == 0)
    {
        w = w / 10;
    }
    r = w % 10;
    cout << r << endl;
}


int main()
{
    int t;
    cout << "Wprowadz liczbe testow:" << endl;
    cin >> t;
    for (int i = 0; i < t; i++)
    {
        otsil();
    }
}