CPP

factorial function C++

#include<iostream>

using namespace std;

int factorial(int x){
	if(x==0){               // Base-case   ( VERY IMPORTANT)
		return(1);
	}
	else{
	   return(x*(factorial(x-1))) ;
	}
}
	
int main(){
    int no = 5;
    
    cout << factorial(no) ;    // 120
}

factorial calculator c++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll fact(ll a){
    ll ans = 1;
    ll curr = 1;
    while(a--){
        ans *= curr;
        curr++;
    }
    return ans;
}
int main(){
  	int x;
  	cin >> x;
  	cout << fact(x) ;
}