判断输入数的位数和每位数的多少

import java.util.Scanner;
public class TestDemo {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);//键盘输入数字
System.out.println("请输入一个数");
		int a = sc.nextInt();
		int temp=10;
		String str = String.valueOf(a); //将数字转换成字符串
		int b = str.length();        //判断该字符串长度，即数字位数
		System.out.println("该数字："+b+"位，");
		while(b>0){                        
			int x = a%temp;                //得到末尾数数字
			a = a/temp;                        
			System.out.print(x+",");
			b--;
		}
	}
}