#include "stdafx.h"
#include <map>
#include <stack>
#include <string>
#include <iostream>
using namespace std;

template<class Data, class Argv, class Ch>
class bf{
public:
    Argv N = 0;
    stack<Argv> stack;
    map<Argv, Ch> symbol;

    void compile(Data &input, Argv &x)
    {
        for (unsigned int i = 0; i < input.length(); i++)
        {
            switch (input[i])
            {
            case '+':
                symbol[N]++;
                break;
            case '-':
                symbol[N]--;
                break;
            case '>':
                N++;
                break;
            case '<':
                N--;
                break;
            case '[':
                stack.push(i);
                break;
            case ']':
                if (symbol[N] != 0)
                {
                    if (stack.empty())
                    {
                        cout << "Ошибка: различное количество скобок" << endl;
                        break;
                    }
                    i = stack.top();
                }
                else
                    stack.pop();
                break;
            case '.':
                cout << symbol[N];

                break;
            case ',':
                cin >> symbol[N];
                break;
            }

        }
        if (stack.empty())
        {
            cout << endl << "f(x) = " <<pow(sin(x), 2);
        }
    }

};
void main()
{
    setlocale(0, "");
    string input;
    bf<string,int,char> bf;
    int x = 0;
    input = "+[------->++<]>++.-.++++++++.+[--->+<]>.--[->+++<]>+.----------.+++++.++[++>---<]>.[->+++<]>.[--->+<]>+.+++.++++++.---------.-[-->+++<]>-.";
    cout << "x = "; cin >> x;
    bf.compile(input,x);
    cout << endl;
}