Compilare: user.cpp: In function ‘int CMMDC(int, int, int&, int&)’: user.cpp:27:15: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int x0, y0, d; ^ user.cpp: In function ‘int main()’: user.cpp:42:6: warning: unused variable ‘d’ [-Wunused-variable] int d = CMMDC(N, M, x, y); ^ user.cpp: In function ‘int CMMDC(int, int, int&, int&)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^