void list2(FILE *plik)
{
	char bufor[MAX_BUFOR];
	unsigned len;
	STUDENT *B = NULL, *P = NULL;

	H = (STUDENT *)NULL;
	T = (STUDENT *)NULL;
	while (!feof(fd))
	{
		B = (STUDENT *)malloc(sizeof(STUDENT));
		if (H == (STUDENT *)NULL)
		{
			H = B;
			H->p = (STUDENT *)NULL;
		}
		else
		{
			P->n = B;
			B->p = P;
		}
		B->n = (STUDENT *)NULL;

		fscanf(fd, "%d", &(B->user_id));
		fscanf(fd, "%d", &(B->age));
		fscanf(fd, "%s", bufor);
		len = (unsigned)strlen(bufor);

		B->gender = (char*)malloc(len);
		strcpy(B->gender, bufor);

		fscanf(fd, "%s", bufor);
		len = (unsigned)strlen(bufor);
		B->occupation = (char*)malloc(len);
		strcpy(B->occupation, bufor);
		fscanf(fd, "%s", bufor);
		len = (unsigned)strlen(bufor);
		B->zip_code = (char*)malloc(len);
		strcpy(B->zip_code, bufor);

		P = B;
	}
		T = B;

}