Compilare: user.cpp: In function ‘int main()’: user.cpp:13: warning: unused variable ‘x’ user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: warning: ‘cont’ may be used uninitialized in this function user.cpp:13: warning: ‘cif’ may be used uninitialized in this function