Question

编写一个Java应用程序。用户从键盘输入一个1～99999之间的数，程序将判断这个数是几位数

Answer 1

import java.util.Scanner;

public class Count {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int i = in.nextInt();
int count = 0;
while(i != 0){
i /= 10;
count++;
}
System.out.println(count);
}
}

Answer 2

Scanner in = new Scanner(System.in);
int i = in.nextInt();
System.out.println((i+"").lenght());

Answer 3

输入的数字小于10怎么办? i/10么?

Answer 4

N位- - 无奈