Held: Wednesday, 29 October 2014

Back to Outline 31 - Naming Local Procedures. On to Outline 33 - Turtle Graphics.

Summary

We consider characters and strings, two basic types in Scheme. Strings are used to represent text in Scheme, and characters are the building blocks of strings.

Related Pages

• Reading: Characters and Strings
• Lab: Characters and Strings
• EBoard 32 (Source 32) (HTML 32)

Overview

• Representing text.
• Characters: The basic building blocks.
• Combining characters into strings.

Administrivia

• New partners!
• Review sessions tonight at 8pm, Thursday at 10am, and Thursday at 8pm.
• Quiz topics:
  • Recursion! (list, helper, numeric)
  • Preconditions, husk, kernel
  • Letrec and named let
  • Characters and strings

Upcoming Work

• Sign up to meet with me if you had difficulty on the exam (or even if you just want to discuss a few more problems or need help interpreting my scrawls).
• Lab writeup: Problems 5 and 6, http://bit.ly/151-2014F-w32.
• Reading for Friday: Turtle Graphics
• Homework 6, due Tuesday.
• Exam 3, distributed a week from today, due two weeks from yesterday.

Extra Credit Opportunities

Academic

• CS Extra Thursday: Randomness in Computer Science.

Peer Support

• Noteworthy is going to be performing at 7:30 PM at Herrick Chapel on Halloween night (Friday the 31st).
• Football (Saturday at 1pm)
• Swimming scrimmage noon on Saturday
• Karan's radio show 11pm Thursday nights on KDIC
• Evan's radio show 5pm Friday nights on KDIC
• Donna's radio show Sunday midnight on KDIC

Characters and Strings

• Characters: The building blocks of strings
• Strings: Collections of characters
• Together: The basics types for input and output in Scheme.
• Also: A nice way to name things.

Lab

• Do the lab.
• Be prepared to reflect.