public class Zf0Algorithm {

    public static void main(String[] args) {
        System.out.println(zf0(13));
        System.out.println(zf0(0));
        System.out.println(zf0(-25));
    }

    public static int zf0(int num) {
        return (num>>31)|(-num>>>31);
    }
}
 

 1  #test num 13
 0  #test num 0
-1  #test num -25

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