CS21 Practice QUIZ 4, Swarthmore College Fall 2008

Q1] Start a top-down design for the following problem.  
Complete at least the main program as well as another 
function that requires additional sub-functions. 

Design a program that plays the game
Rock-Paper-Scissors. This is a two-player game.  Each player
simultaneously chooses Rock, Paper, or Scissors.  If both players
choose the same thing, it's a tie. If not,
Paper beats Rock, Rock beats Scissors, and Scissors beats
Paper.  In your game, have the computer be one player and have a
human user be the other player.  Play multiple games until the user
wants to quit, then report how many times each player won.



Q2] Trace through the following program and show the final output
of the program. Also draw the stack just before the first call
to helper returns.

def helper(x, y):
    z = 0
    while x > y:
        x = x - y
        z = z + 1
    return z

def main():
    n1 = 18
    n2 = 4

    ans1 = helper(n1, n2)
    ans2 = helper(n2, n1)

    print ans1, ans2

main()

Q3] Write a function that, given a file name, opens the file and
stores the first character of each line in a list. The function
should also close the file when done reading it and return 
the list of first characters. Show how your function would
be called from main.

Q4] Write a function that asks the user to enter test scores, and then
returns the test scores in a list. The function should continue asking
for test scores until the user enters a value of -1.