#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#define CELLS_NUM 30000

int main()
{
    unsigned char arr[CELLS_NUM] = {};
    unsigned int current_cell = 0;

    using namespace std;
    string filename;
    cout << "Source:";
    cin >> filename;
    fstream source_file(filename.c_str(), ios_base::in);
    vector<unsigned char>source;
       
    while (!source_file.eof())
    {
     char ch = 0;
     source_file.get(ch);
     source.push_back(ch);
    }

    source_file.close();

    for (unsigned i = 0; i < static_cast<unsigned>(source.size()); ++i)
    {
     unsigned char ch = source[i];
     switch (ch)
     {
     case '>':
      current_cell++;
      break;
     case '<':
      current_cell--;
      break;
     case '+':
      arr[current_cell]++;
      break;
     case '-':
      arr[current_cell]--;
      break;
     case '.':
      cout << arr[current_cell];
      break;
     case ',':
      cin >> ch;
      arr[current_cell] = ch;
      break;
     case '[':
      if (arr[current_cell] == 0)
      {
       unsigned j = 1;
       while (j != 0)
       {
        i++;
        switch (source[i])
        {
        case '[':
         j++;
         break;
        case ']':
         j--;
         break;
        default:
         break;
        }
       }
      }
      break;
     case ']':
      if (arr[current_cell] != 0)
      {
       unsigned j = 1;
       while (j != 0)
       {
        i--;
        switch (source[i])
        {
        case '[':    
         j--;
         break;
        case ']':
         j++;
         break;
        default:
         break;
        }
       }
      }
      break;
     default:
      break;
     }
    }
    system("PAUSE");
}