Compilare: user.c: In function ‘main’: user.c:15:32: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int a, b, i, nr = 0, n, m, q, ok, j; ^ user.c:20:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.c:23:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "\n%c", &car); ^ user.c:26:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %ld", &a, &b, &c); ^ user.c:39:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &q); ^