Compilare: user.cpp: In function ‘void cit(int&)’: user.cpp:14: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:18: 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:58: warning: dereferencing type-punned pointer will break strict-aliasing rules user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:12: warning: dereferencing pointer ‘<anonymous>’ does break strict-aliasing rules user.cpp:17: warning: dereferencing pointer ‘<anonymous>’ does break strict-aliasing rules user.cpp:17: warning: dereferencing pointer ‘<anonymous>’ does break strict-aliasing rules user.cpp:58: note: initialized from here user.cpp:62: warning: ‘py’ may be used uninitialized in this function user.cpp:62: warning: ‘px’ may be used uninitialized in this function