Рекурсия IV

#include <iostream>
using namespace std;

float F (float x, float a, float b)
{
    if (x*x - 5*x < 0) return a + b;
        else if (x*x - 5*x >= 10) return a * b;
            else return a - b;
}

void F (float x, float a, float b, float &y)
{
    if (x*x - 5*x < 0) y = a + b;
        else if (x*x - 5*x >= 10) y = a * b;
            else y = a - b;
}

int main()
{
    float a, b, h;
    cout << "a = "; cin >> a;
    cout << "b = "; cin >> b;
    cout << "h = "; cin >> h;

    //float F
    cout << "float F\n";
    cout << "x\tf(x)\n";
    for (float x = a; x <= b; x += h)
        cout << x << '\t' << F(x, a, b) << '\n';

    //void F
    cout << "void F\n";
    cout << "x\tf(x)\n";
    for (float x = a; x <= b; x += h)
    {
        float y; F(x, a, b, y);
        cout << x << '\t' << y << '\n';
    }

    return 0;
}