C++ :: Initializing Enum Member In Constructer

I am learning OOP Console Programming and i got some error in my code;

Here is my code

#include <iostream>
using namespace std;
enum ch {CD,DVD}
class disk {
private :
ch choice;
[Code] ....

I want to compare the enum variable to char c, and cout CD when user press 'c' and cout DVD when user press 'd'. I got error like this :

error : expected ')' before 'c' at first line after public

Note : I must use enum to store value.