racket encryption video 1/4 --- arithmetic
Channel: Danny Heap
Date: 2012-03-12

Video from http://www.cdf.toronto.edu/~heap/racket_lectures.html on how to manipulate numbers and elephants with DrRacket.  Arithmetic operations are what you'd expect, provided you expect leading operators scaling up to as many numbers as you like.  Elephant operations require some heavy lifting.  Quiz at:

www.cdf.toronto.edu/~heap/Racket/encryption.html    More videos:
www.cdf.toronto.edu/~heap/racket_lectures.html