lab3 daniil etition

#include <iostream>

auto findYEllipse(float x)
{
    const float x0 = -9.5305f;
    const int y0 = -7;
    const int a = 31;
    const int b = 38;
    const int a2 = 961;

    struct r { float yp; float yn; };

    float yOffensive = b * sqrt(1 - (x - x0) * (x - x0) / a2);
    return r{ y0 + yOffensive, y0 - yOffensive };
};

auto findYCircle(float x)
{
    const int x0 = 1;
    const float y0 = 10.9839f;
    const int r2 = 961;

    float yOffensive = sqrt(r2 - (x - x0) * (x - x0));

    struct r { float yp; float yn; };
    return r{ y0 + yOffensive, y0 - yOffensive };
};

float rightpoint(float x)
{
    return (findYCircle(x).yn - findYEllipse(x).yn);
};

float leftpoint(float x)
{
    return (findYCircle(x).yp - findYEllipse(x).yp);
};

float recursive(float start, float stop, float step, float accuracy, int divstep, float (*workfunc)(float))
{
    float prevdiffer = (*workfunc)(start);
    float differ;

    while (true)
        for (float i = (start + step); i <= stop; i += step)
        {
            differ = (*workfunc)(i);

            if (abs(differ) <= accuracy)
                return i;

            if ((prevdiffer > 0) != (differ > 0))
            {
                stop = i;
                start = i - step;
                step /= divstep;
                break;
            }
            else
                prevdiffer = differ;
        };

};

float startrecursive(float start, float stop, float step, float accuracy, int divstep, float (*workfunc)(float))
{
    if (stop < start)
    {
        float t = stop;
        stop = start;
        start = t;
    };

    stop = start + ((int)((stop - start) / step)) * step;
    return recursive(start, stop, step, accuracy, divstep, workfunc);
};

int main()
{
    setlocale(LC_ALL, "RU");
    std::cout << "Выполнил: Ивченко Д.Я. (КЗИ-21-1Б)" << std::endl << std::endl;

    float x = startrecursive(10, 28.45f, 1, 0.0001f, 10, &rightpoint);
    std::cout << "Первая точка: ( " << x << " ; " << findYCircle(x).yn << " )" << std::endl;

    x = startrecursive(-30, 0, 1, 0.0001f, 10, &leftpoint);
    std::cout << "Вторая точка: ( " << x << " ; " << findYCircle(x).yp << " )" << std::endl;
}