Question

This is my assignment prompt

Programming Assignment #6 Help Me Find The Secret Message Description: This assignment will require that you read in an encrypted message from a file, decode the message, and then output the message to a file. The encryption method being used on the file is called a shift cipher (Info Here). I will provide you with a sample encrypted message, the offset, and the decrypted message for testing. For this project I will provide you main.cpp, ShiftCipher.h, and ShiftCipher.cpp. It is your task to add the code required to make them run as explained within the codes TODO comments and this specification. Changes to ShiftCipherh are not allowed.
This is an example of the input and output

This is what I have so far

What is the 3rd ToDo in the main.cpp for open the files and read the encrypted message? Does the rest of the code look accurate?

Answer 1

Your full code

#ifndef PROHECT6_SHIFTCIPHER_H
#define PROHECT6_SHIFTCIPHER_H
#include <string>

using namespace std;

class ShiftCipher
{
public:
   ShiftCipher();
   void setOffset(int messgaeOffset);
   string Encode(string message);
   string Decode(string ciphertext);
private:
   int offset;
};
#endif // ! PROHECT6_SHIFTCIPHER_H

shiftCipher.cpp

#include"shiftcipher.h"

ShiftCipher::ShiftCipher()
{
   offset = 0;
}

void ShiftCipher::setOffset(int messageOffset)
{
   offset = messageOffset;
}

string ShiftCipher::Encode(string message)
{
   //TODO: Add code to encrypt the message
   string encodedMessage = "";
   int range = 91;
   for (size_t i = 0; i < message.length(); i++)
   {
       encodedMessage += (char)((((message[i] - 32) + offset) % range) + 32);
   }
   return encodedMessage;
}

string ShiftCipher::Decode(string ciphertext)
{
   //TODO: Add code to decrypt the message
   string decodedMessage = "";
   int range = 91;
   for (int i = 0; i < ciphertext.length(); i++)
   {
       decodedMessage += (char)((((ciphertext[i] - 32) + (range - offset)) % range) + 32);
   }
   return decodedMessage;
}

main.cpp

#include"shiftcipher.h"
#include<iostream>
#include<fstream>
#include<string>

using namespace std;

void runDecryption();
string getEncryptedFIleName();
string readEncrypterFile(string name, int &messageOffset);
string getDecryptedFileName();
void outputToFile(string name, string);

int main()
{
   runDecryption();
   system("pause");
   return 1;
}

void runDecryption()
{
   string encrypted_name, decrypted_name;
   string encrypted_message, decrypted_message;
   int offset;
   //TODO: Create a ShiftCipher object using defualt constructor
   ShiftCipher obj;

   //TODO: get the encrypted file name
   encrypted_name = getEncryptedFIleName();

   //TODO: open the enctypted file and read in the message
   encrypted_message = readEncrypterFile(encrypted_name, offset);

   //TODO: set the offset for the shift cipher
   obj.setOffset(offset);

   //TODO: decode the message using your ShiftCipher
   decrypted_message = obj.Decode(encrypted_message);

   //TODO: output the file name
   decrypted_name = getDecryptedFileName();

   //TODO: output the message to the file
   outputToFile(decrypted_name, decrypted_message);
}

string getEncryptedFIleName()
{
   string fName;
   cout << "What is the name of you encrypted file?: ";
   cin >> fName;
   return fName;
}

string readEncrypterFile(string name, int &messageOffset)
{
   ifstream inFile;
   string msg;
   inFile.open(name);
   inFile >> messageOffset;
   inFile.get();
   getline(inFile, msg);
   inFile.close();
   return msg;
}

string getDecryptedFileName()
{
   string fName;
   cout << "What is the name of you decrypted file?: ";
   cin >> fName;
   return fName;
}

void outputToFile(string name, string message)
{
   ofstream fout(name);
   cout << "message being save to " << name << "is:\n";
   cout << "\t" << message << endl;
  
   fout << message;
   fout.close();
  
}

output

rawTextSample2.txt

If you have any query regarding the code please ask me in the comment i am here for help you. Please do not direct thumbs down just ask if you have any query. And if you like my work then please appreciates with up vote. Thank You.