Eroare de compilare: user.c: In function ‘coordox’: user.c:37:13: error: ‘M_PI’ undeclared (first use in this function) rad = 2 * M_PI - rad; ^ user.c:37:13: note: each undeclared identifier is reported only once for each function it appears in user.c: In function ‘coordoy’: user.c:48:13: error: ‘M_PI’ undeclared (first use in this function) rad = 2 * M_PI - rad; ^ user.c: In function ‘main’: user.c:60:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:62:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &v[i].x, &v[i].y); ^