Compilare: user.cpp: In function ‘int main()’: user.cpp:28:148: warning: operation on ‘d’ may be undefined [-Wsequence-point] printf ("%.3lf\n", sqrt (sq (R) + sq (d = solve (S, dist (R * cos (Alfa), R * sin (Alfa), R, 0))) - 2.0 * R * d * cos (0.5 * (pi - Alfa)))); ^ user.cpp:23:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (FIN, "r", stdin); ^ user.cpp:24:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (FOU, "w", stdout); ^ user.cpp:25:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf ("%d", &T) ; T ; --T) { ^ user.cpp:26:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %lf %d", &R, &Alfa, &S); ^