#include <stdio.h>
#include <stdlib.h>   /* Pour exit */

#define SIZE 10

struct stfile { int tab[SIZE];
                int taille;   /* taille du tableau tab                      */
                int nbElems;  /* nombre de valeurs stockees dans le tableau */
              };

typedef struct stfile file;

/**********************************************************************/
file creerFile(void)
{
 file f;

 f.taille  = SIZE;
 f.nbElems = 0;

 return f;
}

/**********************************************************************/
void afficherFile(file f)
{
 int i;
 printf("[T] ");
 for(i=f.nbElems-1 ; i>=0; i=i-1)
 {
  printf("%d ",f.tab[i]);
 }
 printf("[Q]");
}

/**********************************************************************/
int estVideFile(file f)
{
 int returnValue = 0;

 if (f.nbElems == 0) returnValue=1;

 return returnValue;
}

/**********************************************************************/
int estPleineFile(file f)
{
 int returnValue = 0;

 if (f.nbElems == f.taille) returnValue=1;

 return returnValue;
}

/**********************************************************************/
int premierFile(file f)
{
 if (estVideFile(f)) { printf("File vide!!!...\n"); exit(1); }

 return f.tab[f.nbElems-1];
}

/**********************************************************************/
void enfilerFile(file* f, int e)
{
 int i;

 if (estPleineFile(*f)) { printf("File pleine!!!...\n"); exit(1); }

 for(i=(*f).nbElems-1 ; i>=0; i=i-1)
 {
  (*f).tab[i+1] = (*f).tab[i];
 }

 (*f).tab[0]  = e;
 (*f).nbElems = (*f).nbElems + 1;
}

/**********************************************************************/
void defilerFile(file* f)
{
 if (estVideFile(*f)) { printf("File vide!!!...\n"); exit(1); }

 (*f).nbElems = (*f).nbElems - 1;
}

/**********************************************************************/
int menu (void)
{
 int rep, minRep = 0 , maxRep = 4;

 do
 {
   printf("\n");
   printf("0. Sortie\n");
   printf("1. Afficher la file\n");
   printf("2. Afficher la tete\n");
   printf("3. Enfiler un element\n");
   printf("4. Defiler un element\n");

   printf("Votre choix:");
   scanf("%d",&rep);

   if (rep < minRep || rep > maxRep) { printf("Erreur de saisie\n"); }

  } while (rep < minRep || rep > maxRep);

 return rep;
}

/**********************************************************************/
int main(void)
{
 file f = creerFile();
  
 int rep;

 rep = menu();

 while (rep!=0)
 {                                /* On peut aussi faire des if..else */
  switch (rep)
  {
    case 1: { afficherFile(f);
              printf("\n");
              break;
            }
    case 2: { if (estVideFile(f))
              {
               printf("Attention, file vide!\n");
              }
              else { int premier = premierFile(f);
                     printf("La tete de la file est : %d\n",premier);
                   }
              break;
            }
    case 3: { if (estPleineFile(f))
              {
               printf("Attention, file pleine!\n");
              }
              else { int elem;
                     printf("Element a enfiler?\n");
                     scanf("%d",&elem);
                     enfilerFile(&f,elem);
                   }
              break;
            }
   default: { if (estVideFile(f))
              {
               printf("Attention, file vide!\n");
              }
              else { defilerFile(&f); }
              break;
            }
  }

  rep = menu();
 }

 printf("Sortie du programme\n");

 return 0;
}