Pavel's code

#include <iostream>
#include <vector>
#include <string>
#include <time.h>
using namespace std;
const int max_num = 8;
const string intro = "Count the number of railway wagons";
const string error_word = "Input is incorrect. Try again!";
const string answer_word = "answer";
const string next_word = "next";
const string switch_word = "switch";
const string previous_word = "previous";
const string light_on = "The light is on";
const string light_off = "The light is off";
const string Continue = "Continue? (Y/N)>";
const string action_select = "Input an action (next/previous/switch/answer)>";
const string correct_answer = "The answer is correct";
const string incorrect_answer = "The answer is incorrect";
const char EOLN = '/n';
const char space = ' ';
const char yes_lit = 'Y';
const char no_lit = 'N';
void _message(string message)
{
    cout << message << endl;
}
bool space_check()
{
    if ((cin.rdbuf()->in_avail()) > 1)
    {
        char c = EOLN;
        cin.get(c);
        if (c == space) return space_check();
        else return false;
    }
    else return true;
}
void clean()
{
    cin.clear();
    cin.ignore(cin.rdbuf()->in_avail());
}
int main()
{
    srand(time(NULL));
    char k = yes_lit;
    _message(intro);
    while (k == yes_lit)
    {
        bool n = true;
        int b = rand() % max_num + 1;
        vector <bool> a(max_num);
        for (int i = 0; i < b; i++)
        {
            if (rand() < 16000) a[i] = true;
            else a[i] = false;
        }
        for (int i = 0; n; )
        {
            if (a[i]) _message(light_on);
            else _message(light_off);
            string c;
            for (bool g = true; g == true; c.clear())
            {
                cout << action_select;
                clean;
                cin >> c;
                if (space_check())
                {
                    if (c == next_word)
                    {
                        i++;
                        g = false;
                    }
                    else if (c == previous_word)
                    {
                        i--;
                        g = false;
                    }
                    else if (c == switch_word)
                    {
                        a[i] = !a[i];
                        g = false;
                    }
                    else if (c == answer_word)
                    {
                        int temp;
                        cout << "Answer is>";
                        clean();
                        while (!(cin >> temp) || !space_check())
                        {
                            clean();
                            _message(error_word);
                            cout << "Answer is>";
                        }
                        if (temp == b)  _message(correct_answer);
                        else _message(incorrect_answer);
                        g = false;
                        n = false;
                    }
                    else _message(error_word);
                }
                else _message(error_word);
                clean();
            }
            if (i == b) i = 0;
            if (i < 0) i = b;
        }
        k = EOLN;
        cout << Continue;
        cin >> k;
        while (!(k == yes_lit || k == no_lit) || !space_check())
        {
            clean();
            _message(error_word);
            cout << Continue;
            cin >> k;
        }
    }
    system("pause");
    return 0;
}