Computer Science City College of New York
CSc21200 Data Structures,
Fall
2011
Programming Assignment 2:
Implement and Test the sequence Class Using a Fixed-Sized
Array (Chapter 3)
Modified from projects of Chapter 3 at
www.cs.colorado.edu/~main/projects/
of Data Structures and Other Objects Using C++ by Michael Main
and Walter
Savitch
- The Assignment:
- You will implement and test the sequence class using an array to
store the sequence's items.
- Purposes:
- Ensure that you can write a small class that uses an array as a
private member variable.
- Familiarize yourself with the sequence container class (which
may
also be part of future assignments).
- Give us a chance to evaluate your programming skills on a small
class.
- Before Starting:
- Read all of Chapter 3.
- Due Date:
- Wednesday,
September 28th before midnight. If you have
problems, late work will be accepted on Thursday with no penalties.
Late work may be submitted on Friday or Saturday with 5% penalty
per day. No work will be accepted after Saturday.
- How to Turn In:
- Pack your files in a WinZip file (Windows) or tar
file (Unix). Attach the file in your email with "CSC212 Assignment 2"
in
your
message Subject line, send it to me ( zhu@cs.ccny.cuny.edu)
- Files that you must write and turn in:
- sequence1.h: The header file for the sequence class.
Actually, you don't have to write much of this file. Just start with our version and add your name and other
information at the top. Also, decide on appropriate private member
variables, an declare these in the sequence class definition at the
bottom o the header file
If some of your member functions are implemented as inline functions,
then
you may put those implementations in this file too.
- sequence1.cxx: The implementation file for this first
sequence class. You will write all of this file, which will have the
implementations of all the sequence's member functions.
- Other files that you may find helpful:
- sequence_test.cxx:
A simple interactive test program.
- sequence_exam.cxx: A
non-interactive test program that will be used to grade the correctness
of your sequence class.
The sequence Class Using a Fixed-Sized Array
Discussion of the Assignment
Many of the features of this class are similar to the bag class
from Section 3.1, so start by thoroughly reading Section 3.1 and pay
attention to new features such as static constant members and
the use of a typedef. The sequence class itself is discussed in
Section 3.2 of the class text. Notice how the sequence differs from a
bag (see page 119). The interactive test program sequence_exam.cxx is discussed
in Section 3.3 of the class text.
Start by declaring the sequence's private member variables in
sequence.h. Then write the invariant of your ADT at the top of
sequence1.cxx. The invariant describes precisely how all of your
private member variables are used. All of the member functions (except
for the constructor) may count on the invariant being true when the
member function is activated. And all of the member
functions are responsible for ensuring that the invariant is true when
the
function returns.
As always, do your work in small pieces. For example, my first
version of the sequence had only a constructor, start, insert, advance,
and current. My other member functions started out as stubs.
Use the interactive test program and a debugger to track down errors
in your implementation. If you have an error, do not start making
changes until you have identified the cause of the error.
The ability to initialize and use a static member constant within
the class definition is a relatively new feature. If you have an older
compiler that does not support static const members, then you may use
enum {CAPACITY = 30};
instead of
static const size_type CAPACITY = 30;
After this definition, the name bag::CAPACITY is defined to
have the integer value 30. Although this is not the intended use of an
enum
definition, the result is the same as using a static member constant
(see
more discussions at page 99 in the textbook).
Zhigang Zhu (
zhu@cs.ccny.cuny.edu ), 2011