Compilare: user.cpp: In function ‘int main()’: user.cpp:114:10: warning: unused variable ‘cstr’ [-Wunused-variable] char cstr[2048]; ^ user.cpp:99:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ratina.out", "w", stdout); ^ user.cpp: In constructor ‘Reader::Reader(const char*)’: user.cpp:28:33: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, sizeof buf, f); ^ user.cpp: In member function ‘void Reader::move()’: user.cpp:20:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, sizeof buf, f); ^