JAVA內建Integer.toBinaryString()

import java.util.Scanner;

public class Java{

public static void main(String[] args){

Scanner sc = new Scanner(System.in);

while(sc.hasNext()){

~記得輸入不只一行~

System.out.println(Integer.toBinaryString(sc.nextInt()));

~JAVA內建直接將輸入之整數轉換成二進位形式的字串~

}

}

}