Ex. 8.13

import java.util.Scanner;
public class E813
{
    private double x;
    private int y;

    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        System.out.println("enter integer here:");
        scan = new Scanner();
    }
    if (y < 0)
    {
        x = -1 / (Math.pow(x, y));
    }
    if (y.isEven && y.isPositive)
    {
        x = Math.pow(x, y/2);
    }
    if (y.isOdd && y.isPositive)
    {
        x = Math.pow(x, y-1);
    }
}