O.2.2.cpp

// 2.2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include <cstdlib>
#include <algorithm>

using namespace std;

string to_string(int number)
{
    string str = "";
	while (number) {
		str += (char)('0' + number % 10);
		number /= 10;
	}

	reverse(str.begin(), str.end());
	
	return str;
}

int to_int (string str) {
	int result = str[0] - '0';
	
	for (int i = 1; i < str.length(); i++) {
		result += (str[i] - '0') * 10	;
	}

	return result;
}

int from_A_to_B(int A, int B) {
	string result = to_string(A);
	
	for (int i = A + 1; i <= B; i++){
		result += to_string(i);
	}
	
	return to_int(result);
}

string sfrom_A_to_B(int A, int B) {
	string result = to_string(A);
	
	for (int i = A + 1; i <= B; i++){
		cout << "to_string(i): " << to_string(i) << endl;
		result += to_string(i);
		
	}
	
	return result;
}

int _tmain(int argc, _TCHAR* argv[])
{
	int A;
	int C;

	cout << sfrom_A_to_B(1, 10) << endl;
	cout << from_A_to_B(1, 10) << endl;

	cout << "Write number A: ";
	cin >> A;
	cout << endl;

	cout << "Write number C: ";
	cin >> C;
	cout << endl;

	int B = A + 1;
	int AB = from_A_to_B(A, B);
	
	while (AB % C != 0) {
		B++;
		AB = from_A_to_B(A, B);
	}
	
	cout << "B is: " << B << endl;
	cout << "AB is: " << AB << endl;

	int a;
	cin >> a;

	return 0;
}