Compilare: user.cpp: In function ‘int main()’: user.cpp:30:12: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] double x,y; ^ user.cpp:30:14: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] double x,y; ^ user.cpp:27:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("romb.in","r",stdin); ^ user.cpp:28:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("romb.out","w",stdout); ^ user.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:33:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%lf%lf",&dx,&dy,&k,&cx,&cy); ^