#include <iostream>
#include <cstdio>
#include <cmath>
#include <clocale>
double Delta = 0.0000001;

double Round(double X, double delta)
{
    if(delta <= 1E-9)
    {
        //std::wcout << L"Неверное задание точности округления\n";
        std::cout << "round";
        return 0;
    }
    if(X > 0.0)
        return delta * long((X / delta) + 1.0 / 2);
    else
        return delta * long((X / delta) - 1.0 / 2);
}

double F(double x)
{
    return sinh(x) - x + 1;
}


double HORDA(double Left, double Right, double Eps, int &N) {
    double FLeft = F(Left);
    double FRight = F(Right);
    double X, Y;

    if (FLeft * FRight > 0.0) {
        //puts("Неверное задание интервала\n");
        std::cout << "F*L";
        exit(1);
    }

    if (Eps <= 0.0) {
        //puts("Неверное задание точности\n");
        std::cout << "EPS";
        exit(1);
    }

    N = 0;

    if (FLeft == 0.0) {
        return Left;
    }

    if (FRight == 0.0) {
        return Right;
    }

    do {
        X = Left - (Right - Left) * FLeft / (FRight - FLeft);
        Y = F(X); // результаты и скорость сходимости
        //Y = Round(F(X), Delta); // чувствительность метода к ошибкам
        if (Y == 0.0) {
            return X;
        }

        if (Y * FLeft < 0.0) {
            Right = X;
            FRight = Y;
        } else {
            Left = X;
            FLeft = Y;
        }

        N++;
    } while (fabs(Y) >= Eps);

    return Round(X, Eps);
}

int main() {
    setlocale(LC_ALL, "Russian");
    int N;
    double eps = 0.1;
    double res;
    const double x = -1.7291169;

    for(int i = 0; i < 7; i++)
    {
        res = HORDA(-2, -1.8, eps, N);

        printf("F(x) = 0 => x = %.7f\n"
               "x* - x = %.7f\n"
               "N(EPS) = %u(%.7f)\n\n",
               res, fabs(res - x), N, eps);

        eps /= 10;
    }
    return 0;
}