JamesMadisonUniversity

Computer Science Department

CS 239 Lab:Review of Iteration, Selection, and Random Number Generation

Objectives:
  • Review iteration problems
  • Review selection problems
  • Review the use of random number generators, specifically the generator in the Math class.

Background:

The lab will be a game of PseudoWar. There will be two players. In each round, the players will each generate an integer in the range of 1 - 52. The player with the higher number wins that round and receives a point. If the numbers are the same, no one receives a point and result is indicated as a tie.  Play continues for a user specified number of rounds. The winner is the person with the most rounds one at the end of the game.

New Terms:

There are no new terms for this lab.

Materials:

You must write this application entirely from scratch.

Acknowledgment

Lab by Elizabeth Adams

1 General Instructions:

Set up your programming environment for this lab. Create a folder named CS239-Lab2a on your flash drive, in your Novell account, or in C:\temp

2 Specific Output:

  1. You must start the game by announcing the start of the program with a welcome message.
  2. You must prompt for the names of the two players.
  3. You must echo the names by asking them how many rounds.
  4. You must echo the number of rounds before play begins with an appropriate message.
  5. The game output  be should look like the following table: 
      Round #         Player1name    Player2name      Winner
     ---------------------------------------------------------
         1                2            7            Player2name
         2                25           22           Player1name
       ...                
         7                16           16           Tie
     
     The game has ended.
     7 rounds were played 
     1 round was a tie.
     Player1name won 3 rounds.
     Player2name won 3 rounds.

               This program has ended normally.

 

3 Other requirements:

Your application must have 2 files, one containing a main method which will control the game and a second which will hold the PseudoWar game.

To gain practice using the Math.random method, you MUST use that method in the program.

Your PseudoWar game file will keep track of each of the players and their accumulated points and carry out the actions using those attributes.

  1. A constructor to set the names of the players, the number of rounds, and their initial scores. Alternately, you could have a default constructor which would call an intro method which would obtain the name of each player and the number of rounds to play. This method may print prompt lines.
  2. A startGame method which prints the first heading lines (See item 5 above) for the output.
  3. A playGame method which will run each round of the game and print the appropriate output.
  4. A generateNumber method that will generate a single number in the 1 - 52 range.
  5. A determineWinner method that receives the two numbers representing the roll of each of the players and returns a 0, 1 or 2 depending on which number is higher. (1 the first number is higher, 2 the second is higher, 0 for a tie). Note, determine winner prints tie in the case of a tie.
  6. A runRound method that uses the generateNumber method and determineWinner method to set the new scores of the players and returns a String with the appropriate round String.
  7. A getFinalResult method that returns a String with the final output including the final game results.

 

5 Steps:

  1. Before you do any coding you must create tests.  Since you are using a Random number generator in this program you will not be able "control" your test cases, but you should test your program thoroughly by running it enough times to see that you have that all possible situations are covered.  Print out and turn in  your test document by the end of the lab period.                                                                                            
  2. The second thing you must do is to build your stubs for your program. In other words, based on the requirements above, create your method signatures, documentation, and appropriate return values where required. You MUST also include within each method inline comments that show how you will carry out that method (remember to document groups of steps, not each individual line). Think carefully about what attributes you will need in your PseudoWar file.
  3. When your stubs are created and documentation done, submit  your stubs. NOTE: These must compile or no credit will be issued. This MUST be done by midnight tonight,  Wednesday, September 27th .    
  4. Next, implement your design. The implemented design must be submitted by  midnight Friday, September 29th.   

6. Grading

  1. You can earn 10 points for your test cases
  2. You can earn  30 points for working stubs that are properly documented.
  3. You can earn  60 points for a correctly working program meeting all specifications.

updated 8/26/08 (esa)