题目

请用户输入年份，在输入月份，输出该月天数

代码

 {/*
            *请用户输年份,再输入月份,输出该月的天数
            * */

            Console.WriteLine("请输入年份");
            string year = Console.ReadLine();
            int nianfen = Convert.ToInt32(year);

            Console.WriteLine("请输入月份");
            string month = Console.ReadLine();
            int yuefen = Convert.ToInt32(month);

            if (yuefen>=1&&yuefen<=12)
            {
                int day = 0;
                switch (yuefen)
                {
                    case 1:
                        day = 31;
                        break;
                    case 3:
                        day = 31;
                        break;
                    case 5:
                        day = 31;
                        break;
                    case 7:
                        day = 31;
                        break;
                    case 8:
                        day = 31;
                        break;
                    case 10:
                        day = 31;
                        break;
                    case 12:
                        day = 31;
                        break;

                    case 2:
                        if ((nianfen % 400 == 0) || (nianfen % 4 == 0 && nianfen % 100 != 0))
                        {
                            day = 29;
                        }
                        else
                        {
                            day = 28;
                        }
                        break;
                    default:
                        day = 30;
                        break;

                }
                Console.WriteLine("{0}年{1}月有{2}天", nianfen, yuefen, day);
            }
            else
            {
                Console.WriteLine("月份必须在1~12月之间！程序退出！！！");
            }

                Console.ReadKey();
            }

效果图