Example sourcecode for a speech

Hello,

hope you all had a great christmas time.

For a speech about C# and the functional Style of Linq, I would like to start with a little bit of the funktional programming history and - of course - about Lisp. And that is my problem. I'm not handy with lisp. Could anyone write a little piece of code according to this functions:



That would help me so much. Thank you in advance!

If you're giving a speech on functional programming, why don't you present examples of functional code?

Hi Dan,

The speech is about .NET Development and especially Linq. Linq itself was influenced by functional languages and I will only show a little bit example code of a full functional language.

Is there anyone who can help me?

Side note: Please type the expression in here next time. Much preferable to an image hosted (temporarily) on another site...

I can't even understand what you're asking for. The image contains three rows, all of the form "DEF area X" where X is a mathematical expression. Is the first row supposed to be "DEF a = \frac{a^2}{4}\sqrt{3}"?

If so, these might be your lisp expressions.

(defun area-1 (a)
  (/ (* a a (sqrt 3)
     4))
(defun area-2 (a b)
  (/ (* a b) 2))
(defun area-3 (a b c)
  (let ((s (/ (+ a b c) 2)))
    (sqrt (* s (- s a) (- s b) (- s c)))))

I have no idea how these show any useful attributes of a functional language or of lisp. They don't use first-class functions, macros, etc. Most people aren't drawn to the appearance of the consistent prefix notation; but many are sold on how it simplifies macros (functions that manipulate other code).