Compilare: user.c: In function ‘main’: user.c:9:17: warning: unused variable ‘hch’ [-Wunused-variable] char ch, lch, hch; ^ user.c:9:12: warning: unused variable ‘lch’ [-Wunused-variable] char ch, lch, hch; ^ user.c:12:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &lenght); ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%c", &ant, &ch); ^