读入一个正整数，判断有多少位

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int n = 0;
        int count = 0;
        System.out.println("Enter a number:");
        Scanner in = new Scanner(System.in);
        n = in.nextInt();
        do {
        n = n / 10;
        count++;
        } while(n>0);
        if (count == 1) {
            System.out.println("The number consists of "+count+" digit.\n");
        }
        else{
            System.out.println("The number consists of "+count+" digits.\n");
        }
    }
}

输入35

Enter a number.
35
The number consists of 2 digits.