Compilare: user.cpp: In function ‘int main()’: user.cpp:8:16: warning: unused variable ‘x’ [-Wunused-variable] int a,cn,n,x=1,i,p=2,e,s,phi; ^ user.cpp:8:20: warning: unused variable ‘i’ [-Wunused-variable] int a,cn,n,x=1,i,p=2,e,s,phi; ^ user.cpp:8:28: warning: variable ‘s’ set but not used [-Wunused-but-set-variable] int a,cn,n,x=1,i,p=2,e,s,phi; ^