Hungry delete not working

Hi, I wanted to use hungry delete while editing. I added the following to my init.el file :- (add-hook 'c-mode-common-hook (lambda () (define-key c-mode-base-map [?\C-c ?\d] 'c-hungry-backspace) (define-key c-mode-base-map [?\C-c ?\C-d] 'c-hungry-delete-forward))) Now, when I press CTRL+C CTRL+D, it says :- "Symbol's function definition is void: c-hungry-delete-forward." It says the same thing for c-hungry-backspace. What are the functions that do hungry delete ? I am using Xemacs 21.4 on windows XP. How do I map keys to do hungry delete in both directions. regards Dhiraj