Factorial

Factorial

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
int main ()
{
  int X, Y;
  double long A;
  string another;
    do
    {
    cout<< "Ingresa un numero." << endl;
    cin>> X;
      int xD=X;
      A=X;
    while (X!=1)
      {
        X=X-1;
        A=A*X;
      } cout<< ""<<xD<<"! es: "<<A<<" " << endl;

        cout<< "¿Quieres probar otro numero?" << endl;
        cin>> another;
        transform(another.begin(), another.end(), another.begin(), ::tolower);
      } while(another=="Si" or another=="si" );
      cout<< "Gracias por usar el programa :)" << endl;

return 0;

}