c#基础

  1 using System;
  2 using System.Globalization;
  3 
  4 class Program
  5 {
  6     public static void Main(string[] args)
  7     {
  8         var year = GetInt();
  9         var month = GetMonth();
 10         var days = 0;
 11         switch (month)
 12         {
 13             case 4:
 14             case 6:
 15             case 9:
 16             case 11:
 17                 days = 30;
 18                 break;
 19             case 2:
 20                 days = IsLeapYear(year) ? 29 : 28;
 21                 break;
 22             default:
 23                 days = 31;
 24                 break;
 25         }
 26         print(days);
 27     } //Main函数结束
 28 
 29     /// <summary>
 30     /// 获得一个正确的月份
 31     /// </summary>
 32     /// <returns></returns>
 33     private static int GetMonth()
 34     {
 35         var m = 0;
 36         while (true)
 37         {
 38             m = GetInt();
 39             if (m > 12 || m < 0)
 40             {
 41                 print("输入的月份有误,请重新输入!");
 42             }
 43             else
 44             {
 45                 break;
 46             }
 47         }
 48         return m;
 49     }
 50 
 51     /// <summary>
 52     /// 判断给定的年份是否是闰年
 53     /// </summary>
 54     /// <param name="year"></param>
 55     /// <returns></returns>
 56     public static bool IsLeapYear(int year)
 57     {
 58         return year % 400 == 0 || year % 4 == 0 && year % 100 != 0;
 59     }
 60 
 61     #region 工具方法
 62 
 63     public static void print(string obj, params object[] arg)
 64     {
 65         Console.WriteLine(obj, arg);
 66     }
 67 
 68     public static void print(object obj)
 69     {
 70         Console.WriteLine(obj);
 71     }
 72 
 73     /// <summary>
 74     /// 获得一个int类型的值
 75     /// </summary>
 76     /// <returns></returns>
 77     public static int GetInt()
 78     {
 79         int i;
 80         while (true)
 81         {
 82             try
 83             {
 84                 i = Convert.ToInt32(Console.ReadLine());
 85                 break;
 86             }
 87             catch (FormatException e)
 88             {
 89                 Console.WriteLine(e.Message);
 90             }
 91         }
 92         return i;
 93     }
 94 
 95     public static string GetString()
 96     {
 97         return Console.ReadLine();
 98     }
 99 
100     public static double GetDouble()
101     {
102         double i;
103         while (true)
104         {
105             try
106             {
107                 i = Convert.ToDouble(Console.ReadLine());
108                 break;
109             }
110 //            catch
111             catch (FormatException e)
112             {
113                 Console.WriteLine(e.Message);
114             }
115         }
116         return i;
117     }
118 
119     #endregion
120 }