CS 435编程讲解、C++程序调试、辅导c/c++程序

日期：2021-03-16 10:18

CS 435/535 Assignment #5 – Spring 2021

Project Overview: This project investigates polymorphism in C++. In C++, polymorphism allows the main

function to be written before an actual class is defined. In this project, you will download from Blackboard the file

main.cpp that contains the main function and the two files (Shape.h and Shape.cpp) that define a base

class named Shape. The Shape base class has a name represented by a private instance variable called name, but

it does not have any other details on the shape. However, the base class has four (4) pure virtual functions: getArea

(it is supposed to compute the surface area of the shape), getVolume (to compute the volume of the shape), test

(to test whether the shape satisfies a list of conditions), and getInfo (to form a string that describes the shape).

You are asked to write four (4) derived classes: Sphere, Cylinder, Cone, and Cuboid. For detailed information

on these four particular shapes, please refer to https://www.mathsisfun.com/geometry/common-3d-shapes.html.

The website also shows how to compute the surface area and the volume of these four shapes. The relationship

between the base class and these four derived classes is shown below. These four derived classes have added their

own instance variables to describe the details of the corresponding shapes. For each derived class, you need to have

one header file (with the .h extension) and one implementation file (with the .cpp extension). However, you can

use any name for the file, any name for the class, and any names for instance variables. The main function does not

need to know the class names you will use. The only requirement is that each derived class must be derived from the

Shape base class, which will force you to implement the four virtual functions in the derived class. Polymorphism

enables the main function to invoke a function of a derived class in the future by just calling the corresponding virtual function of the base

class.

To test the program, we assume that the shapes will be stored in a data file that will be passed to the program as a

command line argument. Each shape will occupy one line in the data file. Each line starts with the <name> that is a

string, followed by the type (sphere, cylinder, cone or cuboid). The rest will be doubles to represent the

dimensions of the shape.

<name> sphere <radius>

<name> cylinder <radius> <height>

<name> cone <radius> <height>

<name> cuboid <length> <width> <height>

You can download a sample data file named shapes.dat from Blackboard for an example. It contains the

following shapes.

Cube#1 cuboid 1 1 1

Cube#2 cuboid 2 2 2

Cone#1 cone 1 1

Cyl#1 cylinder 1 1

Box#1 cuboid 2 4 6

Box#2 cuboid 10.5 21 10.5

UnitSphere sphere 1

LargeSphere sphere 100

Cone#2 cone 1 2

Cyl#2 cylinder 1 2

You need to write a function named readFrom that will return a pointer to a vector of shapes read from a data file

with its name given as a parameter to the function. The function has the following signature.

std::vector<Shape*> *readFrom(std::string);

The signature is stored in a file named reading.h that you can also download from Blackboard. You need to create

a .cpp file to implement the function. You can assume a data file will always follow the correct format as described

above. However, if the file can’t be opened for reading, you shall return a pointer to an empty vector.

As mentioned earlier, you need to implement four virtual functions in each of four derived classes. Please refer to the

website mentioned above on how to compute the surface area and the volume. For the getInfo function, please

see the sample execution at the end on how to format the output string. The test function is to test whether the

shape satisfies a list of conditions. The list of conditions is passed to the function as a parameter and it is a vector of

strings. The number of strings in the vector will always be a multiple of 3. Three consecutive strings form a test

condition in the <name> <op> <value> form. The <name> string will be “type”, “area” or “volume”. The

<op> string is one of the six relational operators (“==”, “!=”, “>=”, “<=”, “>”, and “<”). The <value>

string is the reference value in the string format to be compared with. For the test function to return true, all the

test conditions have to be satisfied. For example, if the string vector contains 9 strings: “type” “>” “cyl” “area”

“<=” “1000” “volume” “>” “100.5”, the function returns true if the shape type is greater than “cyl” and the

surface area is less than or equal to 1000 and the volume is greater than 100.5. If the vector is empty (containing no

testing conditions), the function will always return true. Please see the getTestConditions function in

main.cpp to see how to build a list of test conditions.

In this project, you need to create a makefile to compile the program. Please use the –Wall -std=c++11 options

when compiling your program with g++. The executable of this program shall be named as a.out regardless of the

operating system you are using (using the -o a.out option with g++). Your makefile shall support the

commands "make" to produce a.out, and "make clean" to remove a.out and any object files (with the .o

extension).

What You Need To Do

? Create a directory named project5 on your machine. Download main.cpp, Shape.h, Shape.cpp

reading.h, and shapes.dat from Blackboard to the project5 directory. You can make changes

to shapes.dat for more testing, but make no changes to the other downloaded files.

? Add four (4) derived classes as required. Each class shall have its own header and implementation. You can add

more derived classes for additional shapes and the main function will work with them too without any changes.

? Create a .cpp file to implement the readFrom function, based on its signature in reading.h.

? Create a makefile that supports the commands "make" to produce a.out, and "make clean" to

remove a.out and any object files. Your makefile will be used to compile your program to produce

a.out, and a.out will be used to test your program.

? When you are ready to submit your project, compress your project5 directory into a single (compressed)

zip file, project5.zip. No other compressed files will be accepted. It is not necessary to include the

files downloaded from Blackboard.

? Once you have a compressed zip file named project5.zip, submit that zip file to Blackboard.

? Your submission will be graded on cs-parallel.ua.edu. Make sure to test it on that machine before

submission.

? Make sure to follow the above instructions exactly. Otherwise we may not be able to grade your submission.

Assignment #5 is due at 11:59pm on Friday, March 19. Late projects are not accepted.

This document including its associated files is for your own personal use only.

You may not post this document or a portion of this document to a site

such as chegg.com without prior written authorization.

An assignment shall be completed individually, with no sharing of code or solutions.

All submissions will go through MOSS (Measure Of Software Similarity) for similarity check.

The University of Alabama’s Code of Academic Conduct will be rigorously enforced.

An sample execution of the program

$ ./a.out shapes.dat

Enter a command: print

Cuboid: Cube#1, Length=1.00, Width=1.00, Height=1.00

Surface Area: 6.00, Volume: 1.00

Cuboid: Cube#2, Length=2.00, Width=2.00, Height=2.00

Surface Area: 24.00, Volume: 8.00

Cone: Cone#1, Radius=1.00, Height=1.00

Surface Area: 7.58, Volume: 1.05

Cyliner: Cyl#1, Radius=1.00, Height=1.00

Surface Area: 12.57, Volume: 3.14

Cuboid: Box#1, Length=2.00, Width=4.00, Height=6.00

Surface Area: 88.00, Volume: 48.00

Cuboid: Box#2, Length=10.50, Width=21.00, Height=10.50

Surface Area: 1102.50, Volume: 2315.25

Sphere: UnitSphere, Radius=1.00

Surface Area: 12.57, Volume: 4.19

Sphere: LargeSphere, Radius=100.00

Surface Area: 125663.71, Volume: 4188790.20

Cone: Cone#2, Radius=1.00, Height=2.00

Surface Area: 10.17, Volume: 2.09

Cyliner: Cyl#2, Radius=1.00, Height=2.00

Surface Area: 18.85, Volume: 6.28

Enter a command: print2

Enter test condition #1: type == cuboid

Enter test condition #2: area >= 88

Cuboid: Box#1, Length=2.00, Width=4.00, Height=6.00

Surface Area: 88.00, Volume: 48.00

Cuboid: Box#2, Length=10.50, Width=21.00, Height=10.50

Surface Area: 1102.50, Volume: 2315.25

Enter a command: count1

Enter test condition #1: type > cyl

There are 4 shapes.

Enter a command: count1

Enter test condition #1: type != cuboid

There are 6 shapes.

Enter a command: show

show: invalid action

Valid actions: print count min max total avg

Enter help for help

Enter a command: quit