Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ‘stop’ may be used uninitialized in this function user.cpp:11: warning: ‘cont’ may be used uninitialized in this function user.cpp:11: warning: ‘cif’ may be used uninitialized in this function