Nuclei

#include <iostream>
#include <fstream>
#include <limits>

using namespace std;

int main()
{
    long bytelength, x;
    char * buffer, filepath[256], newfilepath[256];

    cout << "Please type the location of your file:\n";
    cin.getline(filepath,256);

    cout << "\nNow, type the name you wish to save the file as later: \n";
    cin.getline(newfilepath,256);

    ifstream file (filepath, ios::in | ios::binary);
    ofstream newfile (newfilepath, ios::out | ios::binary);

    file.seekg(0,ios::end);
    bytelength = file.tellg();
    file.seekg(0,ios::beg);

    buffer = new char [bytelength];

    file.read(buffer, bytelength);

    for(x = 0; x < bytelength; x++)
    {
          buffer[x] = buffer[x] ^ 0xFF;
    }

    newfile.write(buffer,bytelength);

    file.close();
    newfile.close();
    delete[] buffer;

    cout << "New file complete. Press enter to exit.\n";
    std::cin.ignore( std::numeric_limits<std::streamsize>::max(), '\n' ); //Thanks, Duoas. xD..
    return 0;
}