Compilare: user.cpp: In member function ‘numar numar::operator*(const int&) const’: user.cpp:13:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp: In member function ‘numar numar::operator+(const numar&) const’: user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<v.size()) s+=v[i]; ^ user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<aux.v.size()) s+=aux.v[i]; ^ user.cpp: In function ‘int main()’: user.cpp:44:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrecere.in","r",stdin); ^ user.cpp:45:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrecere.out","w",stdout); ^ user.cpp:47:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^