Compilare: user.c: In function ‘main’: user.c:28:19: warning: unused variable ‘ok’ [-Wunused-variable] int n, m, i, j, ok, op, x, y; ^ user.c:28:16: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, ok, op, x, y; ^ user.c:29:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.c:31:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &op, &x, &y); ^