Eroare de compilare: user.c: In function ‘main’: user.c:19:21: error: ‘fout’ undeclared (first use in this function) fprintf(fout, "%.8lf\n", x); ^ user.c:19:21: note: each undeclared identifier is reported only once for each function it appears in user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &T); ^ user.c:13:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld%lld%lld%lld", &a, &b, &x0, &y0); ^