java http://e-tutor.itsa.org.tw/e-Tutor/mod/programming/view.php?id=30750

Posted 2021-05-08

import java.util.*;  
  
public class Main {  
  
    public static void main(String[] args) {  
        Scanner scn = new Scanner(System.in);  
        int n=scn.nextInt();  
        if(n<0)n+=256;  
        int arr[]=new int [8];  
        for(int i=7;i>=0;i--){  
            arr[i]=n%2;  
            n/=2;  
        }  
        for(int i:arr)  
            System.out.print(i);  
        System.out.println();  
    }  
}