CALCUL DE FACTORIELLE

#include <stdio.h>

void main ()
{
     int i, N;
     double S;

     printf ("Bienvenue dans mon programme de calcul de la factorielle.\n");

     printf ( "Saisir la valeur du chiffre dont vous voulez connaitre la factorielle\n" ) ;
     scanf ( "%d",&N );

     if ( N == 0 )
     {
        printf ( "\n0! = 1\n" );
     }
     else if ( N == 1 )
     {
          printf ( "\n1! = 1\n" );
     }
     else if ( N == 2 )
     {
          printf ( "\n2! = 2\n" );
     }
     else if ( N > 2 )
     {
     S = 2;
     i = 3;
     do
     {
     S = i * S;
     i++;
     }
     while ( i <= N );
     printf ( "\n%d! = %lf\n",N,S );
     }
     else
     {
     printf ( "\nTu as fait n\'importe quoi, comme d\'hab\n" );
     }

     printf ("RMAD PROD©");

     getch () ;
}