Project 2 -- Now posted on the web page.

Mailing List

• GET OFF DIGEST MODE
• DON'T COMPLAIN ABOUT NOT GETTING MAIL!

CS151 -- Administration
 

Midterm -- Reminder July 2 -- Thru Ch. 7

Project 2 due, this week... June 28

Classes

• Information Hiding

Classes

• Information Hiding
• Why?

Classes

• Information Hiding
• Because, users are notoriously untrustworthy

Classes

• Information Hiding
• Because, users are notoriously untrustworthy
• Malicious Users

Malicious Users

Computer Terminology

• Hacker -- RFC 1983
• A person who delights in having an intimate understanding of the internal workings of a system, computers and computer networks in particular. The term is often misused in a pejorative context, where "cracker" would be the correct term. See also: cracker.

 http://members.xoom.com/jcenters/HADL.html

Malicious Users

Computer Terminology

• Cracker -- RFC 1983
• A cracker is an individual who attempts to access computer systems without authorization. These individuals are often malicious, as opposed to hackers, and have many means at their disposal for breaking into a system. See also: hacker, Computer Emergency Response Team, Trojan Horse, virus, worm. http://members.xoom.com/jcenters/HADL.html

Classes

• Information Hiding
• Because, users are notoriously untrustworthy
• Malicious Users
• Ignorant Users

Variables, Revisited

• Persistent Storage

Variables, Revisited

• Persistent Storage
• 'Store it away'

Variables, Revisited

• Persistent Storage
• 'Store it away'
• Global variables

Variables, Revisited

• Persistent Storage
• 'Store it away'
• Global variables
• Changing a Variable's value

Boolean Expressions

• What is a boolean value (true, false, other??)

Boolean Expressions

• What is a boolean value (true, false, other??)
• Precedence:
• not, mathematical, assignment, comparators, and, or