Compilare: user.cpp: In function ‘int memo(int)’: user.cpp:17: warning: suggest parentheses around arithmetic in operand of ‘|’ user.cpp: In function ‘unsigned int getInt()’: user.cpp:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:52: warning: unused variable ‘x’ user.cpp:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result