Main.cc:1:2: error: stray '#' in program V#include ^ Main.cc:1:1: error: 'V' does not name a type V#include ^ Main.cc: In function 'int main()': Main.cc:7:2: error: 'cin' was not declared in this scope cin>>a; ^ Main.cc:9:10: error: 'cout' was not declared in this scope case 1:cout<<"31"<