1. (was #3 on h/w 1)  Write a program to produce computer-generated
  poetry.  You should have (small) stores of nouns, verbs, adjectives,
  adverbs and punctuation.  Math.random() yields a random double
  between 0 and 1, so use this to choose which 'store' to use next, 
  and to choose which thing to print from each store.  Use it also
  to control the lengths of each line.  You might also like to
  arrange thigs so that, for example, if you've just printed a noun,
  you increase the probability that you next print a verb or some
  punctuation.  Experiment with this until you have something you
  like.


2. (was #5 on h/w 1)  Write a text-copy program which reads text in 
  line by line from one file and writes it out to a different file.  
  Ask the user for the file names (be _very_ careful with this!!).
  Include a 'flag' which allows the program to output to the screen 
  the number of characters (non-blank), 'words' (things separated by
  blanks or punctuation), and lines in the copied file.  Modify your
  program so that it can read in the two file names as command line
  arguments.


3.  Write a program to calculate income tax (in an unspecified country)
  according to the following rules:

    - A tax allowance is given according to marital status; a single
      person is allowed $3000, a married person $5000.

    - The pension contribution is 6% of the gross salary.  Taxable 
      income is the sum of the single/married allowance and the pension 
      contribution, subtracted fom the gross annual salary.  Incom tax 
      is based upon taxable income, and is levied at the following 
      rates:
       band 0:  the first $5000 of taxable income attracts tax at 0%
       band 1:  for the part between $5000 and $20000 the rate is 20%
       band 2:  for the part between $20000 and $30000 the rate is 30%
       band 3:  for the part between $30000 and $40000 the rate is 40% 
       band 4:  for the part above $40000 the rate is 50%

  Devise a class PersonTax which contains a constructor to input the 
  name of a person, their gross annual salary, and their marital status. 
  The class should have methods to return the tax allowance, pension 
  contribution, taxable income, income tax payable, and net salary for 
  that person.  Your program should be able to calculate and display 
  the tax data for several people, the output being nicely formatted to 
  the screen.  You program should also be able to provide the choice 
  either to read in data interrogatively from the keyboard or to read 
  in the data from a file (asking for the name of the file) -- the 
  information in the file will be formatted with one line per person, 
  with the data separated by spaces, in the order: 

    last-name   first-name   gross-annual-salary   marital-status.  


4. Create a class VeryLargeInteger which contains the following methods:
  
  public class VeryLargeInteger
    {
      // ------------- appropriate data fields ----------------------
      

      // ------------- constructors ---------------------------------
      public VeryLargeInteger(String value);
      public VeryLargeInteger();  // constructor initialising to zero
     
      // ------------- instance methods -----------------------------
      public VeryLargeInteger addTo(VeryLargeInteger b);
      public VeryLargeInteger subtract(VeryLargeInteger b);
      public VeryLargeInteger multiplyBy(VeryLargeInteger b);
      public VeryLargeInteger divideBy(VeryLargeInteger b);
      public boolean equals(VeryLargeInteger b);
      public boolean isGreaterThan(VeryLargeInteger b);
      public boolean isNotZero(VeryLargeInteger b);
      public void displayNumber();
    }

  Write an interactive program which uses this class to allow the user
  to add, multiply, etc., VeryLargeIntegers from the keyboard.