SWITCH练习（一年第几天的判断）

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;
            }
        }
    }
}