Encrypting and decrypting

[bubbles]

What does the c++ code look like for trying to use a plain.txt and a key.txt file to do encryption and decryption? When I look at this code:

 string original = "super flying monkeys are aweseome, aren't they?";
 cout << "Original data = " << original;
 string encrypted = "";
 string unencrypt = "";
 char key = 'x';

 for (int temp = 0; temp < original.size(); temp++){
  encrypted += original[temp] ^ (int(key) + temp) % 255;
 }
 cout << "nEncrypted data = " << encrypted;

 for (int temp = 0; temp < original.size(); temp++){
  unencrypted += encrypted[temp] ^ (int(key) + temp) % 255;
 }
 cout << "nUnencrypted data = " << unencrypt;

It just takes the string.. simple enough. The book I bought from the book store doesn't really show any examples of taking words from a file, using another file , and then encrypting it into a third file.

[bcrawford]

Here is a fairly simple sample of reading data:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
  // Create an input file stream named input
  ifstream input;

  // Open a file
  input.open("numbers.txt");

  int score1, score2, score3;

  // Read data
  input >> score1;
  input >> score2;
  input >> score3;

  cout << "Total score is " << score1 + score2 + score3 << endl;

  // Close file
  input.close();

  cout << "Done" << endl;
  return 0;
}

and here is one for file output:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
  // Create an output file stream named output
  ofstream output;

  // Create a file
  output.open("numbers.txt");

  // Write numbers
  output << 95 << " " << 56 << " " << 34;

  // close file
  output.close();

  cout << "Done" << endl;
  return 0;
}

You will definitely want to check out the IOstream library here on the website to get more familiar with file input and output.