#include <iostream>
#include <string>
#include <cstdio>
#include <strstream>
#include <conio.h>
using namespace std;

void main()
{
	string fname;
	strstream strstr;
	char xor[20];
	FILE* fl1, * fl2;

	while(1)
	{
		cout << "Enter a file to encrypt or decrypt: ";
		cin >> fname;
		if(cin.good() )
		{
			cin.ignore(10, '\n');
			break;
		}
		cin.clear();
	}


	fl1 = fopen(fname.c_str(),"r");
	if(!fl1)
	{	cout << "ERROR: Could not open file for reading!"; getch(); return; }




	while(1)
	{
		cout << "Enter a file to write to: ";
		cin >> fname;
		if(cin.good() )
		{
			cin.ignore(10, '\n');
			break;
		}
		cin.clear();
	}

	fl2 = fopen(fname.c_str(), "w");
	if(!fl2)
	{   cout << "ERROR: Could not open file for writing!"; getch(); return; }



	while(1)
	{
		cout << "Enter a code to encrypt with: ";
		cin >> xor;
		if(cin.good() )
		{
			cin.ignore(10, '\n');
			break;
		}
		cin.clear();
	}

	
	char chr1, chr2;
	int xrCount=0;
	int xrLen = strlen(xor);

	while(1)
	{
		chr1=fgetc(fl1);
		if(chr1==EOF)
		{
			break;
		}
		else
		{
			if( (++xrCount) >=xrLen) xrCount=0;
			chr2 = chr1 ^ xor[xrCount];
			fputc(chr2, fl2);
		}
	}
	fclose(fl1);
	fclose(fl2);
	cout << "Encrypted successfully.\nPress any key to continue. ";
	getch();
}