Example sourcecode for a speech

Discussion of Common Lisp
veloursnebel
Posts: 3
Joined: Tue Dec 27, 2011 7:36 am

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!

danb
Posts: 35
Joined: Sat Jun 28, 2008 1:05 pm
Location: Urbana, Illinois, US
Contact:

Re: Example sourcecode for a speech

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

veloursnebel
Posts: 3
Joined: Tue Dec 27, 2011 7:36 am

Re: Example sourcecode for a speech

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.

veloursnebel
Posts: 3
Joined: Tue Dec 27, 2011 7:36 am

Re: Example sourcecode for a speech

Is there anyone who can help me?

nuntius
Posts: 538
Joined: Sat Aug 09, 2008 10:44 am
Location: Newton, MA

Re: Example sourcecode for a speech

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.

Code: Select all

(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).