Eroare de compilare: user.c: In function ‘main’: user.c:31:14: error: ‘M_PI’ undeclared (first use in this function) beta = (M_PI/180) * beta; ^ user.c:31:14: note: each undeclared identifier is reported only once for each function it appears in user.c:20:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:27:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %lf %d", r+i, alfa+i, s+i); ^