fREACKING_BRACKETS

//---------------------------------------------------------------------------
#include <dos.h>
#include <iostream.h>
#include <string.h>
#include <vcl.h>
#pragma hdrstop
#pragma argsused
//---------------------------------------------------------------------------

float calcult(std::string& inpt, int x){
        unsigned int i = 0;
        unsigned int i1 = 0;
        unsigned int i2 = 0;
        float opr1 = 1;
        float opr = 0;
        float res = 0;
        bool numHasBegun = false, goOut = false, wasMul = false, wasDiv = false, firstTime = true;

        std::string formtd = "";
        std::string inBuf = "";
        std::string num = "";
        char xToNum[11];

        i1 = 0;
        while(i1 < inpt.length()){
                if(inpt[i1] == 'x' || inpt[i1] == 'X'){
                        itoa(x, xToNum, 10);
                        inBuf += xToNum;
                }
                else
                        inBuf += inpt[i1];
                i1++;
        }

        i1 = 0;
        while(i1 < inBuf.length()){
                while(inBuf[i1] == '+'){
                        i2++;
                        i1++;
                }
                if(i2 && formtd.length() > 0)
                        i1--;
                i2 = 0;
                while(inBuf[i1] == '-'){
                        i2++;
                        i1++;
                }

                if(i2 % 2)
                        formtd += "-";
                if(!(i2 % 2) && i2 != 0 && inBuf.length() > 0)
                        formtd += "+";
                formtd += inBuf[i1];
                i2 = 0;
                i1++;
        }

        while(i < formtd.length()){
                num = "";
                numHasBegun = false;
                goOut = false;

                while((isdigit(formtd[i]) || formtd[i] == '+' || formtd[i] == '-' || formtd[i] == '.' || formtd[i] == 'x') && !goOut){
                        if(numHasBegun && (formtd[i] == '+' || formtd[i] == '-'))
                                goOut = true;
                        num += formtd[i];
                        numHasBegun = true;
                        if(!goOut)
                                i++;
                }

                opr = atof(num.c_str());

                if(!wasMul && !wasDiv && formtd[i] != '*' && formtd[i] != '/')
                        res += opr;

                if(formtd[i] == '*' || wasMul){
                        opr1 *= opr;
                        wasMul = true;
                        if(formtd[i] != '*' && formtd[i] != '/'){
                                wasMul = false;
                                res += opr1;
                                opr1 = 1;
                        }
                        if(formtd[i] == '/'){
                                wasDiv = true;
                                wasMul = false;
                        }
                }

                if(formtd[i] == '/' || wasDiv){
                        if(firstTime){
                                opr1 = opr;
                                firstTime = false;
                        }
                        else
                                opr1 = opr1 / opr;
                        wasDiv = true;

                        if(formtd[i] != '/' && formtd[i] != '*'){
                                cout << opr1 << endl;
                                wasDiv = false;
                                firstTime = true;
                                res += opr1;
                                opr1 = 1;
                        }

                        if(formtd[i] == '*'){
                                wasDiv = false;
                                wasMul = true;
                        }
                }
                        if(!goOut)
                                i++;
        }
        return res;
}

int main(int argc, char* argv[]){
        const min = -10, max = 10;
        unsigned int i = 0, brktBorder = 0, brktBorder1 = 0;
        int x = 2;
        bool mode = false, brkts = true;
        int decP, sign;

        std::string input = "";
        std::string buffer = "";
        std::string out = "";

        /*
        while(input != "mn" && input != "at"){
                cout << "Ruchnoi ili auto rezhim? (mn/at): ";
                std::getline(std::cin, input);

                i = 0;
                while(i < input.length()){
                        while(input[i] == ' ')
                                input.erase(i, 1);
                        i++;
                }
        }

        if(input == "mn")
                mode = true;

        if(input == "at")
                mode = false;
        */
        cout << "Vvedite formulu funktcii: ";
        std::getline(std::cin, input);

        i = 0;
        while(i < input.length()){
                while(input[i] == ' ')
                        input.erase(i, 1);
                i++;
        }

        while(brkts){
                i = 0;
                brkts = false;
                brktBorder = 0;
                brktBorder1 = 0;
                out = "";
                while(i < input.length()){
                        if(input[i] == '('){
                                brktBorder = i;
                                brkts = true;
                        }
                        i++;
                }
                i = brktBorder;
                buffer = "";
                while(input[i] != ')' && i < input.length()){
                        buffer += input[i];
                        i++;
                }

                brktBorder1 = i;
                if(brktBorder1 >= input.length())
                        brktBorder1 = input.length() - 1;

                buffer = fcvt(calcult(buffer, x), 15, &decP, &sign);
                buffer.insert(decP, ".");

                i = 0;
                while(i < brktBorder){
                        out += input[i];
                        i++;
                }

                out += buffer;

                i = brktBorder1 + 1;
                while(i < input.length() && brktBorder1 < input.length() - 1){
                        out += input[i];
                        i++;
                }

                input = out;
        }
        cout << out << endl;
        system("pause");
        return 0;
}
//---------------------------------------------------------------------------