data structure 2

| October 22, 2018

COSC 2007 –Data
Structures II

Assignment #2

Due: Friday, February 14th, 2014
Building a Binary Search Tree

this assignment, you are to write a program that analyzes a selection of text,
counting the number of times each word appears in the text. Your word counts
must ignore capitalization, so the, The, THE, and tHe
all increase the count for the word “the” by one. For purposes of this
assignment, a word is any consecutive string of letters and the apostrophe
character, so don’t counts as a single word, and best-selling
counts as two words: best and selling. Notice that a blank space
will not necessarily occur between two words. Numbers such as 27 and 2/3
will NOT be counted as words.

must store the words and the counts of the words in a single binary search
tree. Each word occurring in the text can only be stored once in the tree. Call
the structure for the nodes of the tree WordNode, and call the
references in this structure left and right. Use Strings to store
words in the tree. Call the class implementing the binary search tree WordTree.
It must contain the following public methods:


add: adds the given word to the tree if
it is not already in the tree OR increments the appropriate counter if it is
already there. It returns nothing.

returns the number of words currently stored in the tree.

countWordsWith4Chars: returns the number
of words which have exactly four characters.

print: display the words of the tree in
alphabetical order, and next to each word, prints the number of times each word
occurs in the text.

Three of these operations (all but add) must visit
every node in the tree. One of these must use preorder traversal, one must use
inorder traversal, and one must use postorder traversal. You must decide which
to use for each method, but use comments to document the type of traversal

WordTree class may have only one data member variable, root, and it must be

Your program
should perform the following steps:

1. Prompt
the user for the name of the file (a string). Use the string input by the user
as an argument to open file:

2. Open
the file on disk, and process its contents, adding unique words to the BST and
increasing the counts of existing words if necessary

steps 1&2 until the user enters some sentinel value.

out the total number of nodes in your tree
out the number of words which have exactly four characters.
out the contents of a tree in alphabetical order

if you have time, implement a method to delete every node from your BST that
contains a word that is 3 or fewer letters long (note that you must explicitly
make these deletions, not fail to insert these words in the first place).


Hand in your complete Java source code;
and a copy of the resultsafter
your program ongiven

your source code to CMS
your program to TA before/on the due day

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