Compilare: user.cpp: In function ‘int main()’: user.cpp:11:9: warning: unused variable ‘n’ [-Wunused-variable] int n,i,j,ok; ^ user.cpp:12:12: warning: unused variable ‘c1’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:15: warning: unused variable ‘c2’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:18: warning: unused variable ‘c3’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:21: warning: unused variable ‘c4’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:28: warning: unused variable ‘a2’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:31: warning: unused variable ‘b2’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^ user.cpp:12:38: warning: unused variable ‘nr’ [-Wunused-variable] double c1,c2,c3,c4,a,b,a2,b2,sum,nr; ^