2500 Lab 4

CS 2500 Spring 2011
Lab 4

Abstract Data Types and C++ Classes

Please see modifications below

We want to create an ADT that represents a rectangle (similar to the one for a sphere we saw in class). Below is a pseudocode implementation of the operations for the rectangle ADT.

+Rectangle()
// Creates a rectangle and initializes its length and width to default
// values.

+Rectangle (in length:double, in width:double)
// Creates a rectangle and initilializes its length and width to the
// values received as parameters.

+setLength (in length:double)
// Sets or modifies the length of an existing rectangle.
// Checks to make sure that the new length is greater than 0.

+setWidth (in width:double)
// Sets or modifies the width of an existing rectangle.
// Checks to make sure that the new width is greater than 0.

+getLength():double {query}
// Returns a rectangle’s length.

+getWidth():double {query}
// Returns a rectangle’s width.

+area():double {query}
// Determines a rectangle’s area.

+perimeter():double {query}
// Determines a rectangle’s perimeter.

+displayStatistics(){query}
// Displays statistics of a rectangle.

1. Implement the rectangle ADT in C++, based on the pseudocode above. (Note you will need to create a header file and an implementation file.)
2. Write a client program to test your ADT. The client should allow a user to create some rectangles and manipulate them and then print out the statistics.
More details on the client
    there are two options: interact with the user OR hardcoded
    you will get 10 points of extra credit for doing both
All functionality should be tested, for example:
    create a default object and one with length and width specified (hard coded or by user input) and display statistics
    test get and set for each changable data value, here is some code you could consider
       cout << "Setting length to 12\n";
       myrect.setlength(12);
       cout << "New length: " << myrect.getlength() << endl;
    display statistics once you have finished the changes
Do the rectangle first then the colored rectangle

Script should show the hard coded output and minimal user interaction
You do need to be able to demonstrate catching bad input (e.g. negative length values) and handling it

Part 2, Colored Rectangle

In order to get a feel for inheritance, we would like to create a subclass of Rectangle, called ColoredRectangle.
1. Create a C++ header file and implementation file for your new class. Follow Carrano's subclass ColoredSphere on pages 151 and 152. For example you will need to write two new constructors and functions to getColor and setColor.
2. Modify your client to use your ColoredRectangle class.

Some notes on compiling classes and clients:

1. I have modified Sphere.cpp and SphereDemo.cpp so that they should compile without warnings.
2. Here are two ways to compile a client:
    a. compile it with the class: quick, but can compound debugging:
mmartin@sol:(~/2500) g++ SphereDemo.cpp Sphere.cpp
mmartin@sol:(~/2500) a.out

Radius = 1
Diameter = 2
Circumference = 6.2831
Area = 12.5664
Volume = 4.18879
8.4

    b. Compile the class first (using -c flag), with a named output file (-o flag):
mmartin@sol:(~/2500) g++ -c Sphere.cpp -o Sphere.o
this creates an object file called Sphere.o (like a.out)
if it doesn't compile you can debug your class before confusing the situation with possible bugs in the client

        Now compile your client:
mmartin@sol:(~/2500) g++ SphereDemo.cpp Sphere.o -o SphD.o
mmartin@sol:(~/2500) SphD.o

Radius = 1
Diameter = 2
Circumference = 6.28318
Area = 12.5664
Volume = 4.18879
8.4
This creates the object file SphD.o.
If you want to know more about g++, just type man g++ on the command line.

Here is the required comment format for significant functions (courtesy of Dr. Sarraille):

/****************************************
    FUNCTION NAME:
    INPUT:
    OUTPUT:
    PRECONDITIONS:
    POSTCONDITIONS:
    CALLERS:
    CALLEES:
*****************************************/

What to Submit

Name your files:
    Rectangle.h
    Rectangle.cpp
    rectangleDemo.cpp
    ColoredRectangle.h
    ColoredRectangle.cpp
    script_rectangle

Turn in your programs and script to the CS Homework Submission System at https://hopper.csustan.edu/cshomework/
             Choose instructor: cs2500mm
             Choose course: CS2500
             Choose assignment: Lab4