how to make a factorial program in c++ code example

Example 1: factorial in c++

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

int fact(int i){
	if (i <= 1) return 1;
  	else return i*fact(i-1);
}

int main(){
  	ios::sync_with_stdio(0);
  	cin.tie(0);
  	int N;
  	cin >> N;
  	cout << fact(N) << "\n";
  	return 0;
}

Example 2: fcatorianls c++

#include <iostream> 

//n! = n(n-1)!
int factorial (int n)
{
  if (n ==0)
  {
    return 1; 
  }
  else 
  {
	return n * factorial(n-1); 
  }
}