Bisection Method by Me

#include <iostream>
#include <cstdlib>
#include <cmath>

#define POSITIVE 1
#define NEGATIVE -1

using namespace std;

class BisectionMethod{
        int next_i, limit;
        int lower_bound, upper_bound;
        double step;
        double eps;
    public:
        BisectionMethod(int, int, double, double);
        double f(double);
        double* givePoints();
        double calcRoots(double, double);
        void displayRoots();
        int signOf(double);
};

inline double BisectionMethod::f(double x){
    return (x-1.11)*(x-1.12)*(x-1.13)*(x + 1.14);
}

inline int BisectionMethod::signOf(double val){
    if(val < 0){
        return NEGATIVE;
    }
    else{
        return POSITIVE;
    }
}

BisectionMethod::BisectionMethod(int lower_bound, int upper_bound, double step, double eps){
    BisectionMethod::upper_bound = upper_bound;
    BisectionMethod::lower_bound = lower_bound;
    BisectionMethod::step = step;
    BisectionMethod::next_i = 0;
    BisectionMethod::eps = eps;
    limit = (int)((BisectionMethod::upper_bound - BisectionMethod::lower_bound) / BisectionMethod::step);
}

double* BisectionMethod::givePoints(){
    double curr_x, next_x;
    double *arr = new double[2];
    for(int i = next_i; i < limit; i++){
        curr_x = lower_bound + (i * step);
        next_x = lower_bound + ((i + 1) * step);
        // Check if f(curr_x) and f(next_x) are of opposite signs
        double f_curr_x = f(curr_x);
        double f_next_x = f(next_x);
        if((f_curr_x * f_next_x) < 0){
            next_i = i + 2;
            arr[0] = curr_x;
            arr[1] = next_x;
            break;
        }
    }
    return arr;
}

double BisectionMethod::calcRoots(double a, double b){
    int count = 1;
    //cout << "SNO\t\ta(-ve)\t\tb(+ve)\t\tc\t\tf(c)\t\tSign of f(c)\n";
    double c;
    double fc;
    double last_fc;
    do{
        //cout << count << "\t\t" << a << "\t\t" << b << "\t\t";
        c = (a + b) / 2;
        fc = f(c);
        if(signOf(fc) == POSITIVE){
            b = c;
        }
        else {
            a = c;
        }
        //cout << c << "\t\t" << fc << "\t\t" << signOf(fc) << endl;
        //cin.get();
        if(count != 1){
            if((last_fc - fc) < eps){
                break;
            }
        }
        last_fc = fc;
        count++;
    }
    while(fabs(fc) > eps);
    return c;
}

void BisectionMethod::displayRoots(){
    double *arr = NULL;
    double root;
    do{
        arr = givePoints();
        root = calcRoots(arr[0], arr[1]);
        cout << "Root between " << arr[0] << " and " << arr[1] << " is " << root << endl;
        cin.get();
        delete arr;
        arr = NULL;
    }while(next_i != limit);
}

int main() {
    system("cls");
    BisectionMethod obj(-10, 10, 1e-2, 1e-6);
    //double *arr = obj.givePoints();
    //cout << "arr[0] = " << arr[0] << endl;
    //cout << "arr[1] = " << arr[1] << endl;
    //double root = obj.calcRoots(1, 2);
    //cout << "Root = " << root << endl;
    //delete arr;
    obj.displayRoots();
    cin.get();
    return 0;
}