给一个不多于5位的正整数，要求：一、求它是几位数，二、逆序打印出各位数字。

public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个正整数");
        int b = sc.nextInt();
        int count = 0;
        int r = b;
        int x1 = r%10;//个
        int x2 = r/10%10;//十
        int x3 = r/100%10;//百
        int x4 = r/1000%10;//千
        int x5 = r/10000;//万
        while (r>0){
            r/=10;
            count++;
        }
        System.out.println(count);
        if(count == 1){
            System.out.println(x1);
        }
        if(count == 2){
            System.out.println(x1*10+x2);
        }if(count == 3){
            System.out.println(x1*100+x2*10+x3);
        }if(count == 4){
            System.out.println(x1*1000+x2*100+x3*10+x4);
        }if(count == 5){
            System.out.println(x1*10000+x2*1000+x3*100+x4*10+x5);
        }
      /*  while (b!=0)
        {
            System.out.print(b % 10);
            b /= 10;
        }*/

    }