Compilare: user.cpp: In function ‘int main()’: user.cpp:101:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mexc.out","w",stdout); ^ user.cpp: In constructor ‘Buffer::Buffer(std::string, int)’: user.cpp:33:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(name.c_str(),"r",stdin); ^ user.cpp: In member function ‘void Buffer::reFill()’: user.cpp:25:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&Buff[0],1,dim,stdin); ^