4 задание введение в2.0

#include "pch.h"
#include <fstream>
#include <string>
#include <algorithm>
#include <iostream>
#include <ctype.h>



using namespace std;
//Объявляем массив символов русского и английского алфавита
string alpha = "абвгдеёжзийклмнопрстуфхцчшщъыьэюя";
string alphabuf = "абвгдеёжзийклмнопрстуфхцчшщъыьэюя";
int code(char str)
{
	for (int i = 0; i < 33; i++) {
		if (str == alpha[i])
			return i;
	}
}

int main() {
	system("chcp 1251");
	system("cls");
	setlocale(LC_ALL, "Russian");
	ifstream keys("key.txt");
	ifstream start("start.txt");
	ofstream output("out.txt");
	char alphaB[30][2] = { ' ' };
	string message;
	string key;
	string keybuf;
	string crypt;
	cout << endl;
	while (!keys.eof())
	{
		char buf;
		bool check = 0;
		keys >> buf;
		buf = tolower(buf);
		if ((buf >= 'а') && (buf <= 'я'))
		{
			for (int i = 0; i <= keybuf.length(); ++i)
			{
				if (keybuf[i] == buf)
					check = 1;
			}
			if (check == 0)
			{
				keybuf += buf;
				check = 0;
			}
		}
	}
	cout << keybuf;
	for (int i = 0; i < keybuf.length(); ++i)
	{
		for (int j = 0; j < alphabuf.length(); ++j)
		{
			if (keybuf[i] == alphabuf[j])
			{
				alphabuf.erase(j, 1);
				break;
			}
		}
	}
	keybuf += alphabuf;
	cout << endl << alphabuf;
	cout << endl << alpha << endl << keybuf << endl;
	cout << message;
	while (!start.eof()) {
		char buf;
		start >> buf;
		message.erase(0, 1);
		for (int i = 0; i < alpha.length(); ++i)
		{
			if (buf == alpha[i]) crypt += keybuf[i];
		}
	}
	crypt.erase(crypt.length()-1, 1);
	cout << crypt;
	while (!crypt.empty())
	{
		char buf;
		buf = crypt[0];
		crypt.erase(0, 1);
		for (int i = 0; i < alpha.length(); ++i)
		{
			if (buf == keybuf[i]) message += alpha[i];
		}
	}
	cout << endl << message << endl;;
	system("pause");
	return 0;
}