1回答

• 

  慕后端7464182

  2017-08-15 13:01:38

  已采纳

  public class HelloWorld{

  public static void main(String[] args) {

  int num=999;

  int count=0;

  do {

  count++;

  num=num/10;

  } while (num>0);

  System.out.println("它是个"+count+"位的数！");

  }

  }

  
  

  0 0