判断一个数是几位数，并且逆序输出

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(“请输入一个整数：”);
Scanner input = new Scanner(System.in);
int num = input.nextInt();
String a = “” + num ;
int L= a.length();
System.out.println(num+”是” +L + “位数”);
System.out.print(“倒序输出为：”);
for(int i=0;i