Compilare: user.cpp: In function ‘int main()’: user.cpp:29:13: warning: unused variable ‘d’ [-Wunused-variable] int a,b,d,x,y,n; ^ user.cpp:7:5: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(b==0) ^ user.cpp:29:11: note: ‘b’ was declared here int a,b,d,x,y,n; ^