CSC151 2007S, Class 10: Computing with Numbers

Admin:
* This weekend's reading won't be available until late tonight or 
  early tomorrow.
* Homework 6 is now available.
* Narrative exploration of homework 4 distributed last night.
* I'll try to keep introductory notes short today (ha!)

Overview:
* Types.
* Kinds of Numbers.
* Key Numeric Operations.

Notes:
* Okay, I lied, if the modulus is negative, the result of modulo may be
  negative (or zero)
  (modulo 5 -2) => some negative number
  DON'T USE NEGATIVE MODULI