//calcul de la factorielle : boucle while
#include <iostream>

using namespace std;

int main() {
  int n;
  cout << "Calcul de la factorielle, entrez n >= 0 : ";
  cin >> n;
  
  int fact = 1;
  int i = 1;
  while (i <= n) {
    fact = fact * i;
    i++;  //i = i + 1
  }
      
  cout << "La factorielle de " << n << " est : " << fact << endl;

  return 0;
}