楼主 A 这样写对吗？ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; public class Program {     public static void Main() {                      //设置变量保存分数             int score;             //异常捕获，排除错误字符          a: try             {                  score = Convert.ToInt32(Console.ReadLine());             }             catch (Exception)             {                 //输入不合法字符时，跳回重新输入                 goto a;             }             //判断的分数的奇偶             if (score % 2 == 0)             {                 //基数时                 Console.WriteLine((int)score / 2);             }             else             {                 //偶数时                 Console.WriteLine((int)score / 2 + " " + ((int)score / 2 + 1));             }    } }