Compilare: user.cpp: In function ‘int main()’: user.cpp:33:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:33:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp:34:17: warning: unused variable ‘y’ [-Wunused-variable] int n,m,x=1,y,nr=0; ^ user.cpp:34:19: warning: unused variable ‘nr’ [-Wunused-variable] int n,m,x=1,y,nr=0; ^ user.cpp: In function ‘int tab(int, int, int)’: user.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^