我覺得可以這樣啊！
public class HelloWorld{
public static void main(String[] args){
int num = 999;
System.out.println("它是個"+(num+"").length()+"位的數！");
}
}
與心海揚帆
2022-02-24
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2022-03-01
import?java.util.Scanner; public?class?Demo415?{ ????public?static?void?main(String[]?args)?{ ????????int?num?=?999; ????????System.out.print("請輸入一個小于10位的數："); ????????num?=?new?Scanner(System.in).nextInt(); ????????int?count?=?0; ????????if?(num?<?1000000000)?{ ????????????System.out.println(String.format("%d它是個%s位的數！",?num,?String.valueOf(num).length())); ????????} ????} }