How to convert integer in to base -2 using JAVA

Question

If given int array A is [1,0,0,1,1] =9 A[i]*(-2)^i (^ power). How to write a java program get the int array sequence for give integer.

Answer 1

public class A {
    public static void main(String[] args) {
        int [] arr = {1,0,0,1,1};
        for (int i = 0; i < arr.length; i++) {
            arr[i]=9*arr[i]*(int)Math.pow(-2,i);
        }
    } System.out.println(Arrays.toString(arr));
}