C#简单的枚举及结构

using System;
namespace program
{
    enum WeekDays
    {
        a,//
        b,//
        c = ,//11 赋值以后就变成11，不赋值就是2
        d,//
        e,//
        f,//
        g//
    }//不能输入数字

    struct student {
        public string name;
        public char sex;
        public int age;
    }
    class program1
    {
        static void Main(string[] args)
        {
            WeekDays letter;
            letter = WeekDays.e;
            for (letter = ; letter < WeekDays.g; letter++)
            {
                Console.WriteLine(letter);//看看枚举里的值到底是多少
            }

            student Bruce;//结构体的运用
            Bruce.age = ;
            Bruce.name = "布鲁斯";
            Bruce.sex = '男';
            student Talyo;
            Talyo.age = ;
            Talyo.name = "泰勒";
            Talyo.sex = '女';
            Console.WriteLine("姓名：{0}",Bruce.name);
            Console.WriteLine("年龄：{0}",Bruce.age);
            Console.WriteLine("性别：{0}",Bruce.sex);
            Console.WriteLine("姓名：{0}",Talyo.name);
            Console.WriteLine("年龄：{0}", Talyo.age);
            Console.WriteLine("性别：{0}", Talyo.sex);
        }
    }
}