CSU211 Assignment 12 - Spring 2004
The Number Guessing Game Revisited
Figure 63 (p. 331) shows most of the code for building a GUI
for playing the number guessing game, and you completed this
program as part of an earlier assignment (Exercise 22.3.1).
Now you are to modify this program further in the following two ways:
Have the program keep track of how many guesses the player has made
and display a corresponding message each time a new guess is made.
This message can simply say something like "Guesses: 5". Note that
you will need to add another message item to the GUI to allow this
to be displayed. To keep the model and view parts of the program
as separate as possible, develop a function
that only updates the number of guesses but does not display anything
on the GUI. The appropriate callback function will then call this
In addition, have the program allow the user to play multiple games in
a single session. To do this, the GUI will need to have an additional
button on it labeled something like "Play Again". When this button
is clicked, the program will need to be reset to start a new game,
with a new target number to guess and the number of guesses reset
accordingly. (The number of guesses displayed should always be the
number in the current game, not the total number across multiple
games.) To this end, and also to try to
keep the model and view parts of the program separated from each other
as much as possible, you should define the following two functions:
This latter function should be called
when the game first begins and whenever a new game is started
(but it should not call
init-state, which generates a new target number to
guess and initializes the number of guesses
for the start of a game but does not display anything on the
init-guessing-game, which calls
and also updates appropriate fields in the GUI.
Be sure to follow the design recipe for designing functions that maintain
state (Sections 36.3-36.4), including providing contracts and purposes
for all state variables as well as effect statements and tests for all
functions that directly initialize or update these state variables.
(Do not provide tests for functions that update the GUI.)
Do not comment out the part of your program that creates the GUI. We will
run your program when we grade it.