using System;

namespace program

{

    class program1

    {

        static void Main(string[] args)

        {

            program1 fenshu = new program1();

            fenshu.Panduan();

            program1 tian = new program1();

            tian.Tianshu();

        }

        /// <summary>

        /// 计算一年中的第几天

        /// </summary>

        void Tianshu()

        {

            Console.Write("请输入年份=");

            int a = Convert.ToInt32(Console.ReadLine());

            Console.Write("请输入月份=");

            int b = Convert.ToInt32(Console.ReadLine());

            Console.Write("请输入日=");

            int c = Convert.ToInt32(Console.ReadLine());

            int total = ;

            if ((total %  ==  && total %  != ) || (total %  == ))//是否闰年的判断

            {

                total = ;

            }

            switch (b)

            {

                case : total -= ; goto case ;

                case :

                    if ((total %  ==  && total %  != ) || (total %  == ))//闰年二月份有29天

                        total -= ;    //一层可以不使用块

                    else

                        total -= ;

                    goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto case ;

                case : total -= ; goto default;

                default: total += c; break;

            }

            Console.WriteLine("{0}年{1}月{2}日是一年的第{3}天", a, b, c, total);

        }

        /// <summary>

        /// 练习switch

        /// </summary>

        void Panduan()

        {

            Console.Write("请输入学生等级的值=");

            string a = Console.ReadLine();

            switch (a)

            {

                case "A": Console.WriteLine("85-100"); break;

                case "B": Console.WriteLine("70-84  "); break;

                case "C": Console.WriteLine("60-69"); break;

                case "D": Console.WriteLine("不及格"); break;

                default: Console.WriteLine("输入有误"); break;

            }

        }

    }

}