LISP function to return the greater number

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I feel like an idiot asking for help for this, but I have been stuck for hours now, and I haven't been able to find anything on the internet that can help me.

I am trying to write a function in LISP that takes in two parameters and returns the number that is greater. Here's what I have at the moment, but I keep getting errors:

(defun greater (x y)
  (if (> x y) x y))

I am calling it like this:

asked 41 secs ago

Domn Werner

11

LISP function to return the greater number