Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘f1’ [-Wunused-variable] int f1=1,f2=1,a; ^ user.cpp:8:14: warning: unused variable ‘f2’ [-Wunused-variable] int f1=1,f2=1,a; ^ user.cpp:8:19: warning: unused variable ‘a’ [-Wunused-variable] int f1=1,f2=1,a; ^ user.cpp:14:11: warning: ‘n’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<X[n]; ^