java 十进制转成二进制

import java.util.*;
public class HomeWork3_4
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		System.out.print("请输入10进制数：");
		int x = sc.nextInt();
		String a = Integer.toBinaryString(x);
		int m = 0,n=0,i=0,j,b=1;
		int arr[] = new int[32];
		while(true){
		   m = x%2+m*10;
		   n++;
		   x = x/2;
		   if(x==0){
		   break;}
		}
        for(i=n;i>0;i--){
		   for(j=1;j<i ;j++)
			{ b*=10;}
		   arr[i]=m/b;
		   m=m-arr[i]*b;
		   b=1;
		}
		for(i=1;i<=n;i++)
		   System.out.print(arr[i]);
		System.out.println();
		System.out.println(a);
	}
}