樓主可以這樣寫,你可以看看:

import java.util.Scanner;

public class HelloWorld {

????public static void main(String[] args) {

????????Scanner sca = new Scanner(System.in);

????????System.out.println("請輸入一個整數: ");

????????int num = sca.nextInt();

????????int count = 0;

????????while (num > 0) {

????????????num = num / 10;

????????????count += 1;

????????}

????????System.out.println("您輸入了一個 ?" + count + " ?位數");

????????if (count > 10) {

????????????System.out.println("輸入錯誤");

????????}

???}

}

表示樓主代碼沒啥問題

我也不知道，就是直接寫的，eclipse運行正常，請大佬們參考參考，提提意見

public?class?HelloWorld?
{
????public?static?void?main(String[]?args)
????{
????	int?num?=999;??
????	int?count?=?0;
????	for(;num>0;)
????	???{
????		??num=num/10;????
????		??count+=1;
????	???}
	???????System.out.println("輸入的數是"?+?count?+?"位數");
????	
????	???if?(count>10)?
????	???????{
????		????System.out.println("輸入錯誤");
????	???????}
????	
????}
}

問一下錯誤的提示是什么??？