Compilare: user.cpp: In function ‘int main()’: user.cpp:9:10: warning: unused variable ‘n’ [-Wunused-variable] int n=100,n2=5; ^ user.cpp:9:16: warning: unused variable ‘n2’ [-Wunused-variable] int n=100,n2=5; ^ user.cpp:29:5: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<y; ^