Main.cc: In function 'int main()': Main.cc:8:11: error: expected initializer before 'a1' int n a1,a2,; ^ Main.cc:9:10: error: 'a1' was not declared in this scope cin>>a1>>a2>>n; ^ Main.cc:9:14: error: 'a2' was not declared in this scope cin>>a1>>a2>>n; ^ Main.cc:9:18: error: 'n' was not declared in this scope cin>>a1>>a2>>n; ^