answer in c++ Public MethodsReturnTypevoidstringintvoidMethod SignaturePage()Public MethodsReturnTypePageintaddSentence(stringsentence)getSentenceAt(int index)get Number Of Sentences()1.2. Write a back-end class called PageManager and save it in aclass must have the following structure:PagevoidMethod SignatureloadPageFromFile(stringfileName)Protected MembersDataName3writePageToFile(string fileName,Page page)Public MethodsReturn Method SignatureTypecharkey1.3. Write a back-end class called APM11A1Encryptor and save it in a file calledAPM11A1Encryptor.cpp. This class must have the following structure:encryptACharacter(charDescriptioncharacter)A default constructor that will initialiseSentenceCounter to zero.encryptPage(Page page)This method will place add a sentence to the Page.You must make use of the cSentences[] array.This method will retrieve a sentence.This method will return the number of sentencesthere are on the Page.setKey(int key)resThis method must read the content of thespecified file into a Page object and returnthis Page.DescriptionThis method must write the content of aPage object into the specified file.This member will store the key that will be used duringthe encryption process. (You may NOT change the nameof this member)DescriptionThis method must encrypt the received characterby using the key class member and the CaesarCipher encryption technique.This method will encrypt the content of thereceived page parameter by making use of theencryptACharacter() method.This method will set the value of the key datamember. (You may NOT change the name of theinput parameter) Question 1LaiBackgroundYou are required to write program that will read a fille, encrypt the content of the file, and thencreate a new file that contains the encrypted content.Your program will make use of the following classes:Page - This class will be used to represent the content of the file that was read.PageManager - This class will be used to read page content from and to a fille.APM11A1 Encryptor-This class will be used to encrypt the content of a file using the Caesar-Ciphermethod.AdvancedAPM11A1Encryptor-This class will be used to encrypt the content of a file using theExclusive-OR method.Caesar CipherCaesar was a Roman military and political leader during 100BC to 44BC. In order to make thecommunication channels secure during war, he invented an encryption technique called the CaesarCipher. The cipher requires a sentence and a key to function properly. Each character in the sentencewas then shifted according to the value of the key. Computer programmers adapted the cipher so thatit can be used in programs. Each alphabet letter is assigned a value. This value is determined by theposition of the letter in the ASCII table. E.g. A=65, B-66, C-67, D-68 .... X=88, Y=89, Z-90. The key isdetermined by the person who wants to encrypt the sentence. If you select a key=1, and you have asentence="TPG11BT is fun", it will encrypt to: UQH22CU!jt! gvo.Exclusive OR EncryptionThe exclusive-OR method requires a key and a sentence to function properly. The ACII value of eachcharacter in the sentence is exclusive-ORed with the key. E.g. If you select a key-1, and you have asentence="TPG11BT is fun", it will encrypt to: UQFOCU!hr!gto.Below is an example of how to exclusive-OR the charactercharx = 'T';chary=x^1;NB! Please note that you may not add any additional methods or members to the classes ofquestion 1.1-1.4.1.1. Write a back-end class called Page and save it in a file called Page.cpp. This class must have theDataтуреstringon ExerciintcSentences[]SentenceCounterDescriptionThis member will store the sentences on the page.You may assume that a record will never have morethan 34 sentences.This member will store the number of sentences onthe page.

Answer: Introduction C++ is a high-level, general-purpose programming language and is now widely…

Public Methods Return Method Signature Type vaid string int void Public Methods Return Method Signature Type Page Page() addSentence(string sentence) getSentenceAt(int index) get NumberOfSentences() 1.2. Write a back-end class called PageManager and save it in a file called Page Manager.cpp. This class must have the following structure: Data Type int Page loadPageFromFile(string void fileName) Protected Members Name S writePageToFile(string fileName, Page page) Public Methods Return Туре char 1.3. Write a back-en class called APM11A1Encryptor and save it in a file called APM11A1Encryptor.cpp. This class must have the following structure: key Method Signature Description encryptACharacter(char character) A default constructor that will initialise SentenceCounter to zero. This method will place add a sentence to the Page. You must make use of the cSentences[] array. This method will retrieve a sentence. This method will return the number of sentences there are on the Page. encryptPage(Page page) setKey(int key) This method must read the content of the specified file into a Page object and return this Page. Description This method must write the content of a Page object into the specified file. This member will store the key that will be used during the encryption process. (You may NOT change the name of this member) Description This method must encrypt the received character by using the key class member and the Caesar Cipher encryption technique. This method will encrypt the content of the received page parameter by making use of the encryptACharacter() method. This method will set the value of the key data member. (You may NOT change the name of the input parameter)

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter14: Files And Streams

Section: Chapter Questions

Problem 2E: Create a program named FileComparison that compares two files. First, use a text editor such as...