个回答

• qq_慕仰9054617

  2022-02-25 16:07:15

  if (num >= 0  && num<=999999999){
  while(num != 0){
  count++;
  num/=10;
  }
  System.out.println("它是个"+ count+"位的数！");
  } else{
  System.out.println("输入有误！");
  }

  0