Compilare: user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:7:17: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int x1, y1, d; ^ user.cpp: In function ‘int main()’: user.cpp:20:15: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int A, N, d, x, y; ^ user.cpp: In function ‘int euclid(int, int, int&, int&)’: user.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type] } ^