This document provides information about C++ classes and objects. It discusses arrays of class objects, static members and variables, const member functions, and string objects. It also includes examples of catching bugs in C++ code snippets and implementing classes for points, polygons, and rectangles.
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An introduction to pointers and references in C++ (with elements of C++11 and C++14). The presentation introduces the readers to the concepts of pointers and references through the pragmatic need of writing a swap function between integers. Generic programming notions (e.g., type constructors) are adopted when useful for the explanation.
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Objectives Assignment 09 Applications of Stacks COS.docxdunhamadell
Objectives
Assignment 09: Applications of Stacks
COSC 2336: Data Structures and Algorithms Fall 2020
• More practice with recursion.
• Practice writing some template functions.
• Use stack ADT to implement given algorithms.
• Practice using Stack class container given as a library in a separate file. • Look at some common applications of stacks.
Description
In this assignment, you will be using the Stack abstract data type we developed for this unit and discussed in our lectures, to implement 4 functions that use a stack data type to accomplish their algorithms. The functions range from relatively simple, straight forward use of a stack, to a bit more complex. But in all 4 cases, you should only need to use the abstract stack interface functions push(), pop(), top(), and isEmpty() in order to successfully use our Stack type for this assignment and the function you are asked to write.
NOTE
You are to use the Stack ADT abstraction give to you for this assignment. If you are familiar with STL stack containers, you are not to use them for this assignment. Part of the assignment is to look over and learn the Stack ADT implementation we give you here based on our textbook Stack examples.
Setup
For this assignment you will be given the following files:
File Name
assg09-tests.cpp assg09-stackfun.hpp assg09-stackfun.cpp Stack.hpp
Stack.cpp
Description
Unit tests for the member functions
you are to write.
Header file where function prototypes for the functions you write using stacks should go. Implementaiton file, the implementation of the 4 functions you write for this assignment go here. Header file defining a Stack ADT for use in implementing the functions for this assignment. You will not make any modifications in this file, you are only going to be using the given Stack. Implementation file for the Stack ADT
template class. You also do not make any changes in this file either.
Set up a multi-file project to compile the .cpp source files and run them as shown for the class. The Makefile you were given should be usable to create a build project using the Atom editor as required in this class. You will only be adding code to the assg09-stackfun.[hpp|cpp] file in this assignment. The Stack.[hpp|cpp] file contains a Stack container. You are to use this Stack ADT for the 4 functions you are to write for this assignment.
1
The general approach you should take for this assignment, and all assignment is:
Set up your project with the given starting code. The files should compile and run, but either no tests will be run, or tests will run but be failing.
For this project, start by uncommenting the first TEST_CASE in the assg09-tests.cpp file. These are the unit tests to test the functionality of your doParenthesisMatch() function, the member function you are to implement.
AddthecorrectfunctionprototypeforthedoParenthesisMatch()memberfunctionintheassg09-stackfun.hpp header file. The prototyp.
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An introduction to pointers and references in C++ (with elements of C++11 and C++14). The presentation introduces the readers to the concepts of pointers and references through the pragmatic need of writing a swap function between integers. Generic programming notions (e.g., type constructors) are adopted when useful for the explanation.
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Objectives Assignment 09 Applications of Stacks COS.docxdunhamadell
Objectives
Assignment 09: Applications of Stacks
COSC 2336: Data Structures and Algorithms Fall 2020
• More practice with recursion.
• Practice writing some template functions.
• Use stack ADT to implement given algorithms.
• Practice using Stack class container given as a library in a separate file. • Look at some common applications of stacks.
Description
In this assignment, you will be using the Stack abstract data type we developed for this unit and discussed in our lectures, to implement 4 functions that use a stack data type to accomplish their algorithms. The functions range from relatively simple, straight forward use of a stack, to a bit more complex. But in all 4 cases, you should only need to use the abstract stack interface functions push(), pop(), top(), and isEmpty() in order to successfully use our Stack type for this assignment and the function you are asked to write.
NOTE
You are to use the Stack ADT abstraction give to you for this assignment. If you are familiar with STL stack containers, you are not to use them for this assignment. Part of the assignment is to look over and learn the Stack ADT implementation we give you here based on our textbook Stack examples.
Setup
For this assignment you will be given the following files:
File Name
assg09-tests.cpp assg09-stackfun.hpp assg09-stackfun.cpp Stack.hpp
Stack.cpp
Description
Unit tests for the member functions
you are to write.
Header file where function prototypes for the functions you write using stacks should go. Implementaiton file, the implementation of the 4 functions you write for this assignment go here. Header file defining a Stack ADT for use in implementing the functions for this assignment. You will not make any modifications in this file, you are only going to be using the given Stack. Implementation file for the Stack ADT
template class. You also do not make any changes in this file either.
Set up a multi-file project to compile the .cpp source files and run them as shown for the class. The Makefile you were given should be usable to create a build project using the Atom editor as required in this class. You will only be adding code to the assg09-stackfun.[hpp|cpp] file in this assignment. The Stack.[hpp|cpp] file contains a Stack container. You are to use this Stack ADT for the 4 functions you are to write for this assignment.
1
The general approach you should take for this assignment, and all assignment is:
Set up your project with the given starting code. The files should compile and run, but either no tests will be run, or tests will run but be failing.
For this project, start by uncommenting the first TEST_CASE in the assg09-tests.cpp file. These are the unit tests to test the functionality of your doParenthesisMatch() function, the member function you are to implement.
AddthecorrectfunctionprototypeforthedoParenthesisMatch()memberfunctionintheassg09-stackfun.hpp header file. The prototyp.
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For more classes visit
www.snaptutorial.com
General Instructions
Exercises 1, 2, 4, and 5 use the programs in DocSharinglabeled “User-defined classes."
Exercises 7 and 8 use the programs in DocSharinglabeled “Using interfaces."
Assg 14 C++ Standard Template Library (STL)(Extra Credit .docxfestockton
Assg 14: C++ Standard Template Library (STL)
(Extra Credit Opportunity)
COSC 2336 Fall 2019
Dates:
Due: Sunday December 08, by Midnight
Objectives
ˆ Practice using an enterprise level set of data structures and algorithms
provided by the STL.
ˆ Connect what we learned about things like stacks, queues, lists, dictio-
naries, etc. to their implementations and applications from the C++
STL.
Description
This assignment is a bit di�erent than the previous assignments in the class,
and is being given as an extra credit opportunity. The assignment is open
ended. I have described 7 tasks or items you can perform, involving the
C++ standard template library. I will give up to 5 points for each of the 7
tasks (for a total of up to 35 points), that will be considered extra credit,
and applied to your programming assignment portion of the course grade to
make up some points on past programs in the class.
This assignment is open ended. I have not given you any starting code or
tests/assertions to use for the assignment. To get credit for the assignment,
you should submit a single �le named "assg14-stl.cpp". The �le should be
compilable and runnable using the C++ IDE/compiler environment you and
I have been using this semester for the class assignments. I would prefer that
you create a separate function for each of the tasks you chose to submit work
for, and that your main function simply calls each of the functions for the
1
task. Your functions should be documented and code formatted using the
usual class style guidelines. You can make up some work for the functions
to do, e.g. to pass them in a parameter and return a value, if you wish.
However, it is also su�cient to simply have void functions that take no
parameters. You should, though, add some output and test assertions of
your own to demonstrate your code working on the tasks using the STL
containers and algorithms. Also if you do more than 1 task demonstrating
a container, make sure you always use a di�erent type to be stored in the
container. For example, don't demonstrate all of your containers on <int>
values, use a variety like <double> <string> <char>, or even better, create
your own small structure or class and demonstrate a container of those user
de�ned types you created.
You should use our textbook for reference on using the STL containers
and algorithms. Another good online reference for the C++ STL is:
cplusplus.com: http://www.cplusplus.com/reference/stl/
You may work on any of the following tasks for this extra credit oppor-
tunity:
1. The STL divides up its containers into 4 categories. The simplest are
the sequence containers, which are intended to store data and access
it in a sequential manner. Vectors are like basic arrays in C, but they
are dynamic and have the ability to resize themselves automatically
when an element is inserted or deleted. Vectors really use C arrays
for their implementation. Insertion can be done in O(1) time to the
end, though if the vecto ...
Abstract Data Types (a) Explain briefly what is meant by the ter.pdfkarymadelaneyrenne19
Abstract Data Types
(a) Explain briefly what is meant by the term abstract data type (ADT). Give two
reasons why use of ADTs is good programming practice.
(b) Write out a signature, or interface, that defines the operations of a stack ADT.
(c) Consider a string of characters of the form
... (.( ... ).) ...
where ... indicates an arbitrary sequence of characters (except for parentheses),
(.( indicates an arbitrary number (one or more) of opening parentheses, and
similarly ).) indicates an arbitrary number of closing parentheses.
Using only the stack abstraction operations defined above, write pseudocode for
an algorithm that determines, using a stack, whether or not the number of closing
parentheses is the same as the number of opening parentheses.
You may assume the existence of a function read(str,ch) that reads the next character
of string str into ch.
You may also assume that you can invoke a function reportFail, that will cause
termination with failure, and similarly, reportSuccess causes termination with a
success indication.
Further, you may also assume that you can call a function newStack(S) to create
a new empty stack S, and eos(str) that returns false when you reach the end of
the string.
Solution
(a) Explain briefly what is meant by the term abstract data type (ADT). Give two
reasons why use of ADTs is good programming practice.
A data type is a collection of values and a set of operations on those values. That collection and
these operations form a mathematical construct that may be implemented with the use of a
particular hardware or software data structure. The term abstract data type (ADT) refers to the
basic mathematical concept that defines the data type. We have discussed four different
implementations of the list data structure.
In case of implementation of the list with the use of an array, the size of the array gives difficulty
if increased.
To avoid this, we allocate memory dynamically for nodes before connecting these nodes with the
help of pointers.
For this purpose, we made a singly linked list and connected it with the next pointer to make a
chain.
Moving forward is easy but going back is a difficult task.
To overcome this problem, we made a doubly linked list using prev andnext pointers. With the
help of these pointers, we can move forward and backward very easily. Now we face another
problem that the prev pointer of first node and the next pointer of the last node are NULL.
Therefore, we have to be careful in case of NULL pointers. To remove the NULL pointers, we
made the circular link list by connecting the first and last node.
The program employing the list data structure is not concerned with its implementation.
We do not care how the list is being implemented whether through an array, singly linked list,
doubly linked list or circular linked list. It has been witnessed that in these four implementations
of the list, the interface remained the same i.e. it implements the same methods like add, get,
next, start a.
For more classes visit
www.snaptutorial.com
General Instructions
Exercises 1, 2, 4, and 5 use the programs in DocSharinglabeled “User-defined classes."
Exercises 7 and 8 use the programs in DocSharinglabeled “Using interfaces."
ObjectivesMore practice with recursion.Practice writing some tem.docxvannagoforth
Objectives
More practice with recursion.
Practice writing some template functions.
Use stack ADT to implement given algorithms.
Look at some common applications of stacks.Description
In this assignment, you will be using the Stack abstract data type we developed this week and discussed in our weeks lectures, to implement 4 functions that use a stack data type to accomplish their algorithms. The functions range from relatively simple, straight forward use of a stack, to a bit more complex. But in all 4 cases, you should only need to use the abstract stack interface functions push(), pop(), top(), and isEmpty() in order to successfully use our Stack type for this assignment and the function you are asked to write.
For this assignment you need to perform the following tasks.
1. In the rst task, we will write a function that will check if a string of parenthesis is matching. Strings will be given to the function of the format "(()((())))", using only opening "(" and closing ")". Your function should be named doParenthesisMatch(). It takes a single string as input, and it returns a boolean result of true if the parenthesis match, and false otherwise.
The algorithm to check for matching parenthesis using a stack is fairly simple. A pseudo-code description migth be
for each charcter c in expression do
if c is an open paren ’(’ push it on stack
if c is a close paren ’)’:
do
if stack is empty
answer is false, because we can’t match the current ’)’
else pop stack, because we just matched an open ’(’ with a close ’)’
done
done
Your function will be given a C++ string class as input. It is relatively simple to parse each character of a C++ string. Here is an example for loop to do this:
s = "(())";
for (size_t index = 0; index < s.length(); index++)
{ char c = s[index];
// handle char c of the string expression s here }
2. In the next task, we will also write a function that decodes a string expression. Given a sequence consisting of ’I’ and ’D’ characters, where ’I’ denotes increasing and ’D’ denotes decreasing, decode the given sequence to construct a "minimum number" without repeated digits.
An example of some inputs and outputs will make it clear what is meant by a "minimal number".
sequence
output
IIII
->
12345
DDDD
->
54321
ID
->
132
IDIDII
->
1325467
IIDDIDID
->
125437698
If you are given 4 characters in the input sequence, the result will be a number with 5 characters, and further only the digits ’12345’ would be in the "minimal number" output. Each ’I’ and ’D’ in the input denotes that the next digit in the output should go up (increase) or go down (decrease) respectively. As you can see for the input sequence "IDI" you have to accommodate the sequence, thus the output goes from 1 to 3 for the initial increase, becase in order to then decrease, and also only have the digits ’123’, we need 3 for the second digit so the third can decrease to 2.
Take a moment to think how you might write an algorithm to solve this problem? It may be di cult to thi ...
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Home assignment II on Spectroscopy 2024 Answers.pdf
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2. Problems:
An array of class objects is similar to an array of some other data type. To create an array of
Points, we write
To access the object at position i of the array, we write
Parray[i]
and to call a method on that object method, we write
parray [i]. methodName (arg1 , arg2 , ...) ;
To initialize an array of objects whose values are known at compile time We can also allocate an
array of objects dynamically using the new operator (this implicitly calls the default constructor of
each new Point):
1.2 Static members and variables
Static data members of a class are also known as “class variables,” because there is only one
unique value for all the objects of that class. Their content is not different from one object of this
class to another.
For example, it may be used for a variable within a class that can contain a counter with the
number of objects of the class that are currently allocated, as in the following example:
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3. In fact, static members have the same properties as global variables, but they can only be
referenced via the class: either in class methods, via a class instance (someObject.staticVariable, or
via the className::variable construct.
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4. Because these variables are global, if we were to initialize them in a header file we could end up
with that initialization being compiled multiple times (once per time we include the header). To
avoid this, we only include a static member’s “prototype” (its declaration) in the class declaration,
but not its definition (its initialization). This is why line 13 above is necessary, and why if we were
to provide a header file for CDummy, we would still need to put line 13 in a separate .cpp file. If
you get linker errors saying a static int is undefined, check to see whether you’ve included a line
like line 13 in a .cpp file.
Classes can also have static member functions – that is, member functions which are associated
with the class but do not operate on a particular class instance. Such member functions may not
access non-static data members. For instance, we might replace CDummy above with the
following class definition:
getN could then be called as c->getN() or CDummy::getN().
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5. 1.3 const member functions
It is clear what const-ness means for a simple value like an int, but it is not clear what functions
should be available on a const object, since functions may allow modifications in subtle ways that
ought to be forbidden on const objects. To specify to the compiler that a given member function
is safe to call on const objects, you can declare the function with the const keyword. This specifies
that the function is a “read-only” function that does not modify the object on which it is called.
To declare a const member function, place the const keyword after the closing parenthesis of the
argument list. The const keyword is required in both the prototype and the definition. A const
member function cannot modify any data members or call any member functions that aren’t also
declared const. Generally, const member functions should return const values, since they often
return references/pointers to internal data, and we wouldn’t want to allow someone to get a
modifiable reference to the data of a const object.
If an object of class Person would be declared as const Person jesse;, no non-const member
functions could be called on it. In other words, the set of const member functions of a class
defines the set of operations that can be performed on const objects of that class.
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6. 1.4 String objects
Manipulating strings as char * or char[] types tends to be unwieldy. In particular, it is difficult to
perform modifications on strings that change their length; this requires reallocating the entire
array. It is also very difficult to deal with strings whose maximum length is not known ahead of
time. Many C++ classes have been created to solve such problems. The C++ standard library
includes one such class, appropriately called string, defined in header file string under
namespace std.
The string class allows us to do all sorts of nifty operations:
A line-by-line description of the string features this code demonstrates:
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7. 3. We can set strings to normal char *’s.
4. We can use the + operator to append things to a string. Don’t worry about how this works for
now; we’ll see in Lecture 9 how to allow your classes to do things like this.)
5. We can use the == operator to test whether two strings are the same. (If we tried to do this
with char *’s, we’d just be checking whether they point to the same string in memory, not
whether the pointed-to strings have the same contents. To check for string equality with char
*’s, you need to use the function strcmp.
8. We can get a new string object that is a substring of the old one.
9. We can find the index a given string within the string object.
10. We can find a character as well, and we can specify a starting location for the search.
1.5 Type Conversions and Constructors
Any time you call a function, the compiler will do its best to match the arguments you provide
with some function definition. As a last-ditch strategy, it will even try constructing objects for
you.
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8. Say you have a function f that takes a Coordinate object, and that the Coordinate constructor is
defined to take one double. If you call f(3.4), the compiler will notice that there is no f that takes
a double; however, it will also see that it can match the f that it found by converting your
argument to a Coordinate object. Thus, it will automatically turn your statement into
f(Coordinate(3.4)). This applies to constructors, as well. Say you have a Point class, whose
constructor takes two Coordinates. If you write Point p(2.3, 0.5);, the compiler will automatically
turn your statement into Point p(Coordinate(2.3), Coordinate(2.5);.
2 Catch that bug
In this section, the following snippets will have bugs. Identify them and indicate how to correct
them. Do these without the use of a computer!
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14. Point
For the next several problems, you should put your class definitions and function prototypes in a
header file called geometry.h, and your function definitions in a file called geometry.cpp. If your
functions are one-liners, you may choose to include them in the header file.
In this section you will implement a class representing a point, appropriately named Point.
3.1 Foundation
Create the class with two private ints. Name them x and y.
3.2 Constructors
Implement a single constructor that, if called with 0 arguments, initializes a point to the origin – (0,
0) – but if called with two arguments x and y, creates a point located at (x, y). (Hint: You will need to
use default arguments.
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15. 4 PointArray
In this section you will implement a class representing an array of Points. It will allow dynamically
resizing the array, and it will track its own length so that if you were to pass it to a function, you
would not need to pass its length separately.
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16. 4.1 Foundation
Create the class with two private members, a pointer to the start of an array of Points and an int
that stores the size (length) of the array.
4.2 Constructors
Implement the default constructor (a constructor with no arguments) with the following
signature. It should create an array with size 0.
Implement a constructor that takes a Point array called points and an int called size as its
arguments. It should initialize a PointArray with the specified size, copying the values from
points. You will need to dynamically allocate the PointArray’s internal array to the specified size.
PointArray::
PointArray(const Point points[], const int size) Finally, implement a constructor that creates a
copy of a given PointArray (a copy constructor )
PointArray::PointArray(const PointArray& pv)
(Hint: Make sure that the two PointArrays do not end up using the same memory for their
internal arrays. Also make sure that the contents of the original array are copied, as well.)
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17. 4.3 Destructors
Define a destructor that deletes the internal array of the PointArray.
PointArray::~PointArray()
4.4 Dealing with an ever-changing array Since we will allow modifications to our array, you’ll find
that the internal array grows and shrinks quite often. A simple (though very inefficient) way to deal
with this without repetitively writing similar code is to write a member function
PointArray::resize(int n) that allocates a new array of size n, copies the first min(previous array size,
n) existing elements into it, and deallocates the old array. If doing so has increased the size, it’s fine
for resize to leave the new spaces uninitialized; whatever member function calls it will be
responsible for filling those spaces in. Then every time the array size changes at all (including
clear), you can call this function.
In some cases, after you call this function, you will have to subsequently shift some of the
contents of the array right or left in order to make room for a new value or get rid of an old one.
This is of course inefficient; for the purposes of this exercise, however, we won’t be worrying
about efficiency. If you wanted to do this the “right” way, you’d remember both how long your
array is and how much of it is filled, and only reallocate when you reach your current limit or
when how much is filled dips below some threshhold. Add the PointArray::resize(int n) function as
specified above to your PointArray class. Give it an appropriate access modifier, keeping in mind
that this is meant for use only by internal functions; the public interface is specified below.
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18. 4.5 Member Functions
Implement public functions to perform the following operations:
• Add a Point to the end of the array void PointArray::push back(const Point &p)
• Insert a Point at some arbitrary position (subscript) of the array, shifting the elements past
position to the right void PointArray::insert(const int position, const Point &p)
• Remove the Point at some arbitrary position (subscript) of the array, shifting the remaining
elements to the left void PointArray::remove(const int pos)
• Get the size of the array const int PointArray::getSize() const
• Remove everything from the array and sets its size to 0 void PointArray::clear()
• Get a pointer to the element at some arbitrary position in the array, where positions start at 0
as with arrays Point *PointArray::get(const int position) const Point *PointArray::get(const int
position) const If get is called with an index larger than the array size, there is no Point you can
return a pointer to, so your function should return a null pointer. Be sure your member functions
all behave correctly in the case where you have a 0-length array (i.e., when your PointArray
contains no points, such as after the default constructor is called).
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19. 4.5.1
Why do we need const and non-const versions of get? (Think about what would happen if we
only had one or the other, in particular what would happen if we had a const PointArray object.
5 Polygon In this section you will implement a class for a convex polygon called Polygon. A
convex polygon is a simple polygon whose interior is a convex set; that is, if for every pair of
points within the object, every point on the straight line segment that joins them is also within
the object. Polygon will be an abstract class – that is, it will be a placeholder in the class
hierarchy, but only its subclasses may be instantiated. Polygon will be an immutable type – that
is, once you create the Polygon, you will not be able to change it. Throughout this problem,
remember to use the const modifier where appropriate.
5.1 Foundation Create the class with two protected members: a PointArray and a static int to
keep track of the number of Polygon instances currently in existence.
5.2 Constructors/Destructors
Implement a constructor that creates a Polygon from two arguments: an array of Points and the
length of that array. Use member initializer syntax to initialize the internal PointArray object of
the Polygon, passing the Polygon constructor arguments to the PointArray constructor. You
should need just one line of code in the actual constructor body.
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20. Implement a constructor that creates a polygon using the points in an existing PointArray that
is passed as an argument. (For the purposes of this problem, you may assume that the order of
the points in the PointArray traces out a convex polygon.) You should make sure your
constructor avoids the unnecessary work of copying the entire existing PointArray each time it
is called.
Will the default “memberwise” copy constructor work here? Explain what happens to the
PointArray field if we try to copy a Polygon and don’t define our own copy constructor. Make
sure that your constructors and destructors are set up so that they correctly update the static
int that tracks the number of Polygon instances.
5.3 Member Functions
Implement the following public functions according to the descriptions:
• area: Calculates the area of the Polygon as a double. Make this function pure virtual, so that the
subclasses must define it in order to be instantiated. (This makes the class abstract.)
• getNumPolygons: Returns the number of Polygons currently in existence, and can be called even
without referencing a Polygon instance. (Hint: Use the static int.)
• getNumSides: Returns the number of sides of the Polygon.
• getPoints: Returns an unmodifiable pointer to the PointArray of the Polygon.
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21. 5.4 Rectangle
Write a subclass of Polygon called Rectangle that models a rectangle. Your code should
• Allow constructing a Rectangle from two Points (the lower left coordinate and the upper right
coordinate)
• Allow construct a Rectangle from four ints
• Override the Polygon::area’s behavior such that the rectangle’s area is calculated by
multiplying its length by its width, but still return the area as a double.
Both of your constructors should use member initializer syntax to call the base-class constructor,
and should have nothing else in their bodies. C++ unfortunately does not allow us to define arrays
on the fly to pass to base-class constructors. To allow using member initializer syntax, we can
implement a little trick where we have a global array that we update each time we want to make
a new array of Points for constructing a Polygon. You may include the following code snippet in
your geometry.cpp file:
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22. You can then pass the return value of updateConstructorPoints(...) (you’ll need to fill in the
arguments) as the Point array argument of the Polygon constructor. (Remember, the name of an
array of Ts is just a T pointer.)
5.5 Triangle
Write a subclass of Polygon called Triangle that models a triangle. Your code should
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23. • Construct a Triangle from three Points
• Override the area function such that it calculates the area using Heron’s formula:
where a, b, and c are the side lengths of the triangle and s = a+ 2 b+c .
Use the same trick as above for calling the appropriate base-class constructor. You should not
need to include any code in the actual function body.
5.6 Questions
1. In the Point class, what would happen if the constructors were private?
2. Describe what happens to the fields of a Polygon object when the object is destroyed.
3. Why did we need to make the fields of Polygon protected?
For the next question, assume you are writing a function that takes as an argument a Polygon *
called polyPtr.
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24. 4. Imagine that we had overridden getNumSides in each of Rectangle and Triangle. Which
version of the function would be called if we wrote polyPtr->getNumSides()? Why?
5.7 Putting it All Together
Write a small function with signature void printAttributes(Polygon *) that prints the area of the
polygon and prints the (x, y) coordinates of all of its points. Finally, write a small program (a
main function) that does the following:
• Prompts the user for the lower-left and upper-right positions of a Rectangle and creates a
Rectangle object accordingly
• Prompts the user for the point positions of a Triangle and creates a Triangle object
accordingly
• Calls printAttributes on the Rectangle and Triangle, printing an appropriate message first.
6 Strings
In this section you will write a program that turns a given English word into Pig Latin. Pig Latin is a
language game of alterations played in English. To form the Pig Latin version of an English word,
the onset of the first consonant is transposed to the end of the word an an ay is affixed. Here are
the rules:
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25. 9
1. In words that begin with consonant sounds, the initial consonant (if the word starts with ‘q’,
then treat ‘qu’ as the initial consonant) is moved to the end of the word, and an “ay” is
added. For example:
2. • beast : east-bay
3. • dough : ough-day
4. • happy : appy-hay
5. • question : estion-quay
6. In words that begin with vowel sounds, the syllable “way” is simply added to the end of the
word. Write a function pigLatinify that takes a string object as an argument. (You may
assume that this string contains a single lowercase word.)
7. It should return a new string containing the Pig Latin version of the original. (Yes, it is
inefficient to copy a whole string in the return statement, but we won’t worry about that.
Also, your compiler is probably clever enough to do some optimizations.) You may find it
useful to define a constant of type string or char* called VOWELS.
8. Remember that string objects allow the use of operators such as += and +. (Your answers
for this problem should go in a separate file from geometry.h and geometry.cp
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