43p19

#include <iostream>
#include <cmath>

using namespace std;

float F(float x)
{
    if (abs(x) < 2) return sqrt(5*pow(x,2)+5);
    else if (abs(x) >= 10) return 0;
    else return abs(x)/(sqrt(5 * pow(x, 2) + 5));
}

void F(float x, float &y)
{
    if (abs(x) < 2) y = sqrt(5 * pow(x, 2) + 5);
    else if (abs(x) >= 10) y = 0;
    else y = abs(x) / (sqrt(5 * pow(x, 2) + 5));
    cout << y;
}

int main()
{
    float y, x;
    cout << "x = "; cin >> x;
    F(x, y);
    cout << F(x);
    system("pause");
}