Eroare de compilare: user.c: In function ‘myatan2’: user.c:19:16: error: ‘M_PI’ undeclared (first use in this function) return M_PI; ^ user.c:19:16: note: each undeclared identifier is reported only once for each function it appears in user.c: In function ‘main’: user.c:66:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &m); ^ user.c:69:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^