Compilare: user.cpp: In function ‘int main()’: user.cpp:8:11: warning: unused variable ‘a’ [-Wunused-variable] int n,a,b,c,s=0; ^ user.cpp:8:13: warning: unused variable ‘b’ [-Wunused-variable] int n,a,b,c,s=0; ^ user.cpp:8:15: warning: unused variable ‘c’ [-Wunused-variable] int n,a,b,c,s=0; ^ user.cpp:8:17: warning: unused variable ‘s’ [-Wunused-variable] int n,a,b,c,s=0; ^