Held: Tuesday, 13 October 2015

Back to Outline 26 - Preconditions, Revisited. On to Outline 28 - Recursion with Helper Procedures.

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 27 (Source 27)

Overview

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

Administrivia

• Continue partners!
• Review sessions this week
  • Wednesday 8pm (Zachary)
  • Thursday 8pm (Erin)
• I will be AFK (Away from Keyboard) starting about noon on Tuesday. If you have exam questions, try to ask them before then. (I may still be on cell phone, but cell phone answers are less detailed.)

Upcoming Work

• Reading for Wednesday: Recursion with Helper Procedures
• Exam 2
  
  • Exam due in electronic form TONIGHT
  • Exam due in hardcopy Wednesday class time
  • Epilogue due Wednesday night
• Today's Lab writeup (due before class Friday)
  • Email to grader-151-01@cs.grinnell.edu
  • Subject: CSC 151 Lab Writeup Class 27 (Your Names)
  • Exercises:
• Quiz Friday
  • Identify people in class from poorly-photocopied photographs
  • First names provided

Extra Credit Opportunities

• If possible, send me these in advance.

Academic

• Any visit to the current show in the Faulconer gallery
• Met Opera Simulcast on Saturday

Peer Support

• Pals of PALS, pals@grinnell.edu, normally Saturday at 7:45 am (breakfast included), Sunday at 4:45, and Mondays at 4:45. Requires sign up in advance.
• Pun Club, Saturdays, 4pm, Way over Younker.

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.