Encrypt.exe

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

void encrypt();
void decrypt();
void start();

int main()
{
    start();
    system("pause");
    return 0;
}

void start(){
    char choice;
    cout << "Would you like to encrypt, or Decrypt a file?\n" << endl;
    cout << "q.) Quit\n";
    cout << "e.) Encrypt/Decrypt\n";
    
    cin >> choice;


    switch(choice){
    case 'q':
        break;

    case 'e':
        system("cls");
        decrypt();
        system("cls");
        start();
        break;

    default:
        system("cls");
        start();
        break;
    }
}



void decrypt()
{
    fstream ifile;
    fstream efile;
    char key;
    string iput;
    ifile.open("encrypt.txt");
    efile.open("decrypt.txt");

    cout << "Place the text you want to decrypt or encrypt in the file 'encrypt.txt'"<<endl;
    if (ifile.is_open())            
    {
          cout << "What key is the input encrypted in?" << endl;
          cin >> key;                        
          while(!ifile.eof())
          {
           getline(ifile, iput);
           for(int i = 0; iput[i]; i++)
            {
             iput[i] = iput[i] ^ key;    
            }
            efile << iput;
            cout << iput;
          }
          ifile.close();
          efile.close();
    }
    cout << endl;
    system("pause");
}