pow binary, Java - rextester

pow binary

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        System.out.println("Hello, World!");
        
        System.out.println(power(2.0, 1000));
    }
    
    public static double power(double x, int y){
        double result = 1.0;
        long power = y;
        if (y < 0) {
            power = -power;
            x = 1.0 / x ;
        }
        int i = 0;
        while (power != 0) {
            System.out.println("================= iter " + ++i);
            System.out.println("power = " + power + " binary = " + Long.toBinaryString(power));
            System.out.println("in result = " + result);
            System.out.println("x = " + x);
            if ((power & 1) != 0) {
                result *= x;
            }
            x *= x ;
            power >>= 1 ;
            System.out.println("out result = " + result);
        }
        return result ;
    }
}


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