Compilare: user.cpp: In function ‘int main()’: user.cpp:100:60: warning: unused variable ‘mindiff’ [-Wunused-variable] double left = 0, right = PI / 2, rotation = 0, mindiff = 1; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:58:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, MAX_BUFFER_SIZE, 1, file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:50:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, MAX_BUFFER_SIZE, 1, file); ^