IB Computer Science 1

Friday (11/19/10)

Warmup:

• Take out scratch paper and work out the Fibonacci sequence
• Assign variables to the first two numbers
• ...how do you calculate the third number?
• What should happen next?

Agenda:

• Looping Exercises
• GASP w/ loops
• Use the following template in a file named loopGasp.py:

from gasp import *
begin_graphics()

int x = 0
while x < 1000:
    print x
    Circle ( (0, 0), x)
    x = x + 10

update_when('key_pressed')
end_graphics()

• What do you see when you run the code above?
• Let's try to create some other graphics with GASP and loops
  1. Draw a bunch of Circles across the bottom of the screen
  2. Draw Circles along all the sides of the screen (left, bottom, right, top)
  3. Draw a diagonal of Circles from the bottom-left to the upper-right
  4. Draw 100 Circles of random sizes and random locations throughout the screen (HINT: random.randint())
  5. Draw 10 random Circles, but each time you draw a Circle, connect a Line from it to the previous Circle

Wednesday (11/17/10)

Warmup:

• Assume you have the following code:

1 i = 0
2 while i < 10:
3     print "All work and no play makes Jack a dull boy."
4     i = i + 1

• What is the counter variable?
• What is the condition of the loop? (i.e. when does it end?)

Agenda:

• Print Shapes Exercises
• Looping Exercises

Monday (11/15/10)

Warmup:

• Assume you have the following code:

1 a = 0
2 b = 1
3 c = 0
4 a = a + 1
5 c = c + 1
6 b = a * c
7 c = c + 1

• What are the final values of a, b, and c?

Agenda:

• Introduction to Iteration (looping)
  • while loops
  • counter variables
• Looping practice
  • Print out all the numbers from 0-50
  • Print out all the numbers from 75 down to 25
  • Write a loop that prints out the first 100 even numbers
  • Prompt the user for a number and store it in a variable n, then print out the first n odd numbers (starting at 1) using a loop
  • Print out all the numbers that are divisible by 6 from 0 through 100
• Guessing Game Assignment

Wednesday (11/10/10)

Warmup:

• Complete the HTTLACS: Ch 5 exercises and demo to Mr. Bui

Agenda:

• Introduction to GASP
• Creating useful functions

Monday (11/8/10)

Warmup:

1. Prompt the user to enter a decimal (float) number and store in variable x
2. print int(x)
3. print round(x)
4. Test out your program using several numbers (e.g. 3.2, 4.5, 5.9)
5. What do you think the int() and round() functions do?

Agenda:

• Review return
• Review doctests
• Complete the exercises at the end of HTTLACS: Ch 5 (w/ doctests)

Thursday (11/4/10)

Warmup:

• Define a function named slope(x1, y1, x2, y2) that takes the four listed parameters
• Calculate the slope and store it in a variable m
• print m

Agenda:

• Return and go over 1st Quarter Exam
• Re-introduction to Functions
  • return keyword
  • doctests
• HTTLACS: Ch 5
• Complete the exercises at the end of Chapter 5 (w/ doctests)

Monday (11/1/10)

Warmup:

• Prompt the user to enter his/her grade (0-100)
• Using if statements, do the following:
  • if the grade is greater than or equal to 90, then print "You have an A"
  • if the grade is less than 90 and the grade is greater than or equal to 80, then print "You have a B"
  • if the grade is less than 80 and the grade is greater than or equal to 70, then print "You have a C"
  • if the grade is less than 70 and the grade is greater than or equal to 60, then print "You have a D"
  • if the grade is less than 60, then print "You have an E"

Agenda:

• Demo Geek Flow Chart Assignment today
• Go to HTTLACS: Ch 4 and read section 4.11: GASP
• Try out the GASP code to see if it works
• Try to draw a stick figure

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