Compilare: user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:15: warning: unused variable ‘d’ user.cpp: In function ‘int main()’: user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:19: warning: control reaches end of non-void function user.cpp: In function ‘int main()’: user.cpp:30: warning: ‘d’ may be used uninitialized in this function