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Eliminar registo


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Boas pessoal, estou a tentar eliminar um registo de um ficheiro, mas não está eliminar, podem ajudar?

void Eliminar()

char estado = 'A';
int numero;
int n;
printf("Numero do aluno?");
scanf("%d", &numero);

fich = fopen("alunos.DAT","r+b");

if (fich== NULL) {
printf("\nErro ao abrir o ficheiro\n");

fseek(fich, 0, SEEK_END);
n = ftell(fich) / sizeof(a);
fseek(fich, 0, SEEK_SET);

int pos = 0;
int i;
for (i = 0; i < n; i++) {
fread(&a, sizeof(a), 1, fich);

if (estado == 'A')
if (a.codigo == numero) {
pos = i;
if (i < n) {

int eliminar;
printf("Pretende eliminar o aluno?\n");
printf("   1 - Sim           0 - Nao\n");
scanf("%d", & eliminar);
if (eliminar == 0){

fseek(fich, pos * sizeof(a), SEEK_END);
fread(&a, sizeof(a), 1, fich);
fseek(fich, pos * sizeof(a), SEEK_SET);
fwrite(&a, sizeof(a), 1, fich);
printf("O Aluno foi eliminado com sucesso\n");

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