recursion.cpp

#include <iostream>
using namespace std;

int recFactoral(int);

int main(void){
        long unsigned int i = 0;
        cout << "Enter a long number: ";
        cin >> i;
        long unsigned int n = recFactoral(i);
        cout << n << endl;
        return 0;
}

int recFactoral(int n){
        if(n == 1 || n == 0){
                return 1;
        } else{
                return n * recFactoral(n-1);
        }
}