1回答

• 

  秋野4385331

  2024-07-26 19:19:40

  public class HelloWorld{

  public static void main(String[] args){

          int num = 999;

          int count = 0;

          while(num>0){

              num/=10;

              count++;

          }

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

      }

  }

  
  

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