1. Announcements Homework #2 solutions in Blackboard
Homework #4 due Thursday, Oct 18, 4:30pm
bring printout of solutions to Questions 1-4
submit Question 5 using “turnin”
cannot be submitted late!
Upcoming office hours:
Tomorrow: Swati 6:30-7:30pm
Thursday: Greg 11am-12pm 1 1 1

2. Homework #4
Questions #1 and 2 are based on last week's lectures (data movement and control operations)
Question #3 is based on today's lecture
Question #4 is based on Thursday's lecture
Question #5 is based on today's lecture
Do not underestimate this problem! 2 2 2

3. Schedule
Last time: Control operations (5.4); Assembling an LC-3 program (7.3)
Today: LC-3 input/output (8.1 – 8.4)
Thursday: Subroutines & Traps (Ch. 9) 3 3 3

5. Homework #4 Question #5
The user can enter the “r”, “b”, or “g” key to choose red, blue, or green as the color
Then they enter a number from 1-9
That many lines are drawn in the selected color
Repeat!
“q” means quit
when getting the color, ignore anything illegal
when getting the number, assume the input is legal 5 5 5

6. Approaching Question #5
Get the program to work such that:
it detects that the user has entered “r”
it draws a single red line
it waits for the next letter
Then, add detection of the other colors
How will you represent which color to draw?
Then, add the “number of lines” feature
How will you draw more than one line?
Then, add the “quit” functionality and handling of illegal keys 6 6 6