Assignment 3: Trees


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CMPT 225 Assignment 3: Trees
In this assignment you are to implement (in C++) a pointer-based binary search tree to store and
retrieve customer data.
Start by downloading the assignment files. This zipfile contains a makefile, a test script and ground
truths, and stubs for all of the .h and .cpp files you need.
Please do not create any additional .h or .cpp files.
You can add to the .h files, but do not modify any of the provided method prototypes.
You can modify customer_app.cpp for testing, but your code must work with the
original customer_app.cpp.
Customer Class
Customer.h, Customer.cpp
The customer class represents a customer of some fictional enterprise. The customer class should
have the following attributes:
Last name (name) – stored as a string (for which you will need to include the C++ string class:
#include < string using namespace std;) )
First initial (initial) – stored as a single character (i.e. type char)
Account balance (account) – the amount currently owed by the customer
And these methods:
Default constructor
Constructor(string, char, int) where the parameters are the values for last name, first initial and
Getters for each attribute
Setter for the balance (not required for the other attributes)
Overloaded operators for the comparison operators (<, <=, , =, ==, !=). This will allow you to
compare two contacts in the same way that base type comparisons are made. The
comparison should be made alphabetically, by last name, and then initial. For example Smith J
is greater than Smith H, and Smith J is less than Smythe H. Note that the string class also
overloads the comparison operators so you can compare two strings in this way.
Overloaded operator for the cout << operator to allow you to output contacts. The output must
be this:
Customer c(“Doe”, ‘J’, 3344);
cout << c;
should print:
Doe, J. (3344)
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It is very important that your output looks exactly like this. The auto-grading script will
require this output to function properly.
You can find some basic instruction on how to overload the comparison operators and the cout <<
operator in this lab activity.
Binary Search Tree
BSTree.h, BSTree.cpp
Implement a binary search tree that has the following methods, all methods should preserve the
binary search tree property.
Default constructor – creates an empty tree
Copy constructor – creates a copy of the given tree
Destructor – frees dynamic memory allocated by the tree
bool insert(string, char, int) – creates and inserts a new customer (with the data shown in the
parameters) in the tree, in a new tree node.
bool remove(string, char) – deletes the first node with a matching name and initial from the
tree. Returns true if the deletion was successful (that is, if the customer was found). Note that
two customers are equal if they have the same name and initial, regardless of the account
bool search(string, char) – searches the tree for the given value, returning true if the customer
is found
vector<Customer rangeSearch(string, char, string , char) – returns a vector of Customers
where the customer names (initial and last name) are in the range specified in the parameters.
For example rangeSearch(“Dobbs”, ‘A’, “Fogg”, D) returns all customers whose names are
between Dobbs A and Fogg D.
void inOrderPrint() – prints the contents of the tree in sorted order. The output must be one
customer per line, no other information. E.g. if the tree contains two customers, it must print:
Doe, J. (3344)
Doe, K. (2344)
I expect that you will need to also implement a number of helper methods (which should be private).
Node Class
Node.h, Node.cpp
As part of the tree implementation you should implement a Node class. Each node should contain a
Customer object, pointers to left and right children and (optionally) the parent.
customer_app.cpp (complete, no need to modify)
I have provided an application to maintain a collection of customers. It uses your binary search tree
class as the collection’s container. It allows users to do the following:
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Insert new customers
Delete customers
Search for customer
Print the entire customer collection
Print a range of customers
Read a file of customers into the tree
Note that this application will not function correctly until you have correctly implemented all the
required methods in the Customer and BSTree classes.
Sample Files
Two sample files of customers are included in the zip file. I’d suggest using small_names.txt for your
preliminary testing as it is small enough for you to work out exactly what is going on with it. You can
use the larger one big_names.txt for further testing.
Automated Testing
test_driver.cpp,, *.gt
A test driver test_driver.cpp is provided. It takes a command-line argument that specifies which test
case to run. The test script will run all of the test cases.
Please assert that the first two test cases pass before moving on to the others. The first case checks
the Customer printing, and the second checks the inOrderPrint.
Manual Testing and Debugging
You can run an individual test case in the test driver by supplying a command-line argument
./test_driver 4
You could then compare this output to the ground truth file
You can examine operations interactively using the application customer_app:
You should make changes to all files to print out extra debug information (e.g. insert cout
statements all over BSTree.cpp). Make sure to turn these off before submission and
automated testing. The automated testing wants exactly the output in the .gt files, nothing
else. One quick way to accomplish this is to define a constant, e.g. DEBUG, at the top of a
BSTree.cpp, and only print the debug output if this is true.
#define DEBUG 1

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Assessment and Submission
You should submit your assignment online to the CourSys submission server. You should submit the
Modified BSTree.cpp
Modified Node.cpp
Modified Customer.cpp
Modified BSTree.h
Modified Node.h
Modified Customer.h
Please read the documentation on the submission site for further information.
The submitted files must build with the provided makefile and customer_app.cpp in order to receive
marks. The assignment is worth 10% and marks are allocated to the assignment as follows:
Correctness 6% (provided and held-out test cases)
Memory management 1% (valgrind –error-exitcode=1 -q –leak-check=full ./test_driver 2)
Coding style 3% (use of functions and loops, code indentation and spacing, comments and
variable naming)
if (DEBUG) cout << “Current state of BST is ” << bst.inOrderPrint();

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