how to compile and correct this app.c [on hold]

this is not correct ,i do not why so please can you help me

               #include<stdlib.h>
                #include<stdio.h>
               #include<unistd.h>
               #include<semaphore.h>
               #include<pthread.h>

                sem_t mutex;
               sem_t vide;
               sem_t plein;
               #define N 3
                  #define VRAI 1
              pthread_t prod,cons;
            int tampon[N];
             int libre=0, prochain=0;
           void*producteur(void*arg)
                {
           int objet;
          while(VRAI){
          objet=1+(int)(100.0*rand()/(RAND_MAX+1.0));
          sem_wait(&vide);
          sem_wait(&mutex);
         tampon[libre]=objet;
           printf("Prod:tampon[%d]=%d/n",libre,objet);
          libre=(libre+1)%N;
             sem_post(&mutex);
          sem_post(&plein);
          }
            return(NULL);
            }
           void*consommateur(void*arg)
               {
            int objet;
            while(VRAI){
            sem_wait(&plein);
         sem_wait(&mutex);
         objet=tampon[prochain];
        printf("Cons:tampon[%d]=%d/n",prochain,objet);
         prochain=(prochain+1)%N;
        sem_post(&mutex);
        sem_post(&vide);
           sleep(2);
          }
          return(NULL);
          }
          int main(int argc,char**argv)
           {
        sem_init(&mutex,0,1);
       sem_init(&vide,0,N);
       sem_init(&plein,0,0);
       pthread_create(&prod,NULL,producteur,NULL);
        pthread_create(&cons,NULL,consommateur,NULL);
          pthread_join(&prod,NULL);
       pthread_join(&cons,NULL);
          return 0;
         }