Tri nom

typedef struct eleve
  {
     char nom[ligne][colone];
     int age;
     float moy;
     float note[3];
     float rang;

  }eleve;
void ajouter()
{
  eleve individu[100];
  int n,i;
  float som=0;

  printf("entrer le nombre delts:");scanf("%d",&n);
    for(i=0;i<n;i++)
    {

       printf("entrer le nom:");scanf("%s",&individu[i].nom);
       printf("entrer son age:");scanf("%d",&individu[i].age);
       printf("entrer ses note\n");
       printf("\tmath:");scanf("%f",&individu[i].note[0]);
       printf("\tphy:");scanf("%f",&individu[i].note[1]);
       printf("\tinfo:");scanf("%f",&individu[i].note[2]);

    }
    affiche(individu,n);
    tri_nom(individu,n);
    affiche(individu,n);

}
void tri_nom(eleve tab[],int n)
{
  int i,ok=1;
  eleve aux1[100];
  while(ok==1)
  {
    ok=0;
     for(i=0;i<n;i++)
     {

       if(strcmp(tab[i].nom+i,tab[i+1].nom+i)>0)
       {
         aux1=tab[i];
         tab[i]=tab[i+1];
         tab[i+1]=aux1;
         ok=1;
       }
     }
       }
}