Chapter 12, Problem 4PE

Program Plan Intro

Math Game

Program plan:

Filename: “MathGame.java”

This program file is used to define an abstract class “MathGame”. In the code,

• Define a class “MathGame”.
  • Define the class member variables “player”, “generator” and “in”.
  • Define a constructor “MathGame()”.
    • Initialize the class members by creating the object of classes.
  • Define a method “play()”.
    • Call the method “readPlayerInformation()”.
    • Create a string variable “response”.
    • Create a boolean variable “done”.
    • Iterate a “while” loop,
      • Call the method “playRound()”.
      • Prompt the statement.
      • Get the value of “response” from user.
      • If the value of “response” is not equal to “y”,
        • Set the value of “done” as “true”.
  • Define a method “readPlayerInformation ()”.
    • Declare a string variable “name”.
    • Prompt the user to enter the name.
    • Scan for the value of “name”.
    • Create an integer variable “initialLevel” and assign “0” to it.
    • Create a Boolean variable “done” and set its value as “false”.
    • Iterate a “while” loop,
      • Prompt the statement to the user.
      • Define a “try…catch” block,
        • Get the value of “initialLevel” from the user.
        • If the value of “initialLevel” is between 1-3,
        • • Set the value of “done” equal to true.
      • Catch an exception “e”.
        • Read a new line character.
        • Prompt the user to enter a number between 1 and 3.
        • • • Set “player”.
  • Define a method “playRound()”.
    • Define the variables “i1”, “i2” and “answer”.
    • If the level is 1,
      • Create a Boolean variable “done” and assign “false” to it.
      • Iterate a “while” loop,
        • Set the value of “i1”.
        • Set the value of “i2”.
        • Calculate the value of “answer”.
        • If the value of “answer” is less than 9,
          • Set the value of “done” as “true”.
    • else if the level is 2,
      • Set the value of “i1”.
      • Set the value of “i2”.
      • Calculate the value of “answer”.
      • Print the question.
    • If the level is 3,
      • Define a Boolean variable “done” and set a value “false”.
      • Iterate a “while” loop.
        • Set the value of “i1”.
        • Set the value of “i2”.
        • Calculate the value of “answer”.
        • If the value of “answer” is less than 9,
          • Set the value of “done” as “true”.
      • Print the question.
    • Print the result.
  • Define a method “getResult()”.
    • Define a variable “guess”.
    • If the value of “answer” is not equal to “guess”.
      • Set the value of “guess” again.
        • • • Create a string variable “result”.
            • If the value of “answer” and “guess” are equal,
              • Set the “result”.
              • Call the method “incrementScore()”.
            • Else,
              • Set the “result”.
            • Return the value of “result”.
  • Define a method “getGuess()”.
    • Create a variable “guess”.
    • Create a Boolean variable “done” and set “false”.
    • Create a string variable “input”.
    • Iterate a “while” loop,
      • Define “try” block.
        • If the level is 3,
          • Ask the question.
          • Get the value of “guess”.
        • Else,
          • Ask the question,
          • Get the value of “guess”.
        • If the value of “guess” is greater than 0,
          • Set the value of “done” as true.
      • Define the “catch” block.
        • Read a newline character.
        • Print the statement.
    • Return the value of “guess”.

Filename: “Player.java”

This program file is used to define a class “Player”. In the code,

• Define a class “Player”.
  • Declare the class members “name”, “score” and “level”.
  • Define a constructor “Player()”.
    • Initialize the class members “name”, “score” and “level”.
  • Define a constructor “Player()”.
    • Set the class members “name”, “score” and “level”.
  • Define a method “incrementScore()”.
    • Increment the value of “score” by 1.
    • If the condition “score % 5 == 0 && level < 3” is true,
      • Increment the “level” by 1.
  • Define a method “getLevel()”.
    • Return the value of “level”.
  • Define a method “getName()”.
    • Return the value of “name”.

Filename: “MathGameRunner.java”

This program file is used to define a class “MathGameRunner”. In the code,

• Define a class “MathGameRunner”.
  • Define a method “main()”.
    • Create the object “game” of class “MathGame”.
    • Call the method “play()” and print the value.