Objective

This project will allow you to practice variables, strings, input/output facilities, conditionals, loops, and the Eclipse IDE.

Overview

You will write a very (very) simple game, in which the user will select an animal and then guess how many legs that animal should have.  (It is not a very challenging or interesting game, is it?)

This project is considered "open". Please visit the course web page for information regarding the open/closed policy for projects of this course.

Specifications

Your program knows three things:  A dog has 4 legs, a chicken has 2 legs, and a fish has 0 legs.  That's it.

The program execution consists of two phases:

1. The user specifies what kind of animal he/she is playing with.
2. The user tries to guess how many legs that animal has.

The program begins by prompting the user with:

    Choose an animal:

The user then enters the name of an animal.  At this point one of two things could occur:  Either the animal selected is one of the three animals that the program knows about, or the user has selected an animal that is not on this list.

When the Animal Selected is NOT One of the Three Known Animals

If the animal is not one of the three animals that the program knows about, the program will print:

        I don't know that animal.  Do you want to try again? (y/n)

If the user answers "y", then the program will again ask for the user to enter an animal, and continue from there.  If the user answers "n", then the program should terminate with no further output.

When the Animal Selected is One of the Three Known Animals

The program then asks the user:

    How many legs does a <AnimalSelected> have?

(In the line above, <AnimalSelected> represents the animal chosen by the user:  either "dog", "chicken", or "fish".)

 The user now enters his/her choice, and the program will check whether or not the guess is correct.  If the user guesses correctly, the program will print out:

    You win!

But if the user guesses incorrectly, then the program will print out:

    You lose!

Either way, the program terminates after reporting whether or not the user wins or loses.

Getting Started

In order to help you get started, we have defined a AnimalGame class with a main( ) method in a file named AnimalGame.java. This file can be retrieved by checking out the project from the CVS repository. Remember that you must have set up your repository in order to check out and submit projects.  Information on how to do this can be found in the Managing Homeworks section of the Eclipse tutorial. Follow the instructions given there to check out project p1. Then when you switch back to the Java perspective, you will see the above files, and you will be able to start modifying them.

Requirements

• Your program must use the single class AnimalGame.
• You must use "named constants" for any literal values that will not change during program execution.
• You must use meaningful variable names and good indentation.
• Input and output operations must be implemented as demonstrated in class.  (I.e. use the Scanner class for input, and use System.out.print or System.out.println for output.
• You do not need to worry about incorrect input (other than the user selecting an invalid animal).  You may assume that the responses the user enters are the right types, and that he/she follows instructions.
• You should not modify the project specifications. For example, do not add extra behavior or output.
• We use an automated system to grade projects and it will not be able to grade your project if you do not follow the project specifications closely. In particular, you must spell things exactly as we have spelled them and use punctuation exactly as we have.  You do NOT need to worry about how many spaces to put between words in your output -- it doesn't matter.
• Just in case you know what an array is -- you may not use arrays (or any Java collections of any kind) while implementing this project.
• Your program must terminate without using anything like System.exit().  (Don't worry if you don't know what that is.)

Sample Run

The following provides a sample run of the program you are expected to write. Keep in mind this is just an example and not the only scenario your program is expected to handle. 

    Choose an animal: frog
    I don't know that animal. Do you want to try again? (y/n) y
    Choose an animal: chicken
    How many legs does a chicken have? 100
    You lose!

(Note that the portions above in italics represent the input entered by the user.)

Submission

Submit your project using the submit project option associated with Eclipse.  After you have submitted your project, you should visit the submit server.  There you can obtain limited feedback about how well your project is performing.

Challenge Problem

Modify your program so that it does not use any occurrences of the logical connectives && and ||.  Please read the information on the syllabus about "challenge problems".  You will not receive a higher grade by implementing them.

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