编辑代码

import java.util.Scanner;
public class aa {

	public static void main(String[] args) {
		Scanner in =new Scanner(System.in); 
	    System.out.println("请输入一个十进制整数");
	    int num = in.nextInt();
	    String bin = "";
	    while (num >= 0){
	        int i = num % 2;
	        num = num / 2;
	        bin = bin + i;
	        if (num == 0){
	            break;
	        }
	    }
	    System.out.println("转化成二级制为" + bin);
	    }
	}