复杂的变量类型：枚举、结构、数组（例子）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    enum orientation : byte
    {
        北=1,
        南=2,
        东=3,
        西=4
    }
    struct route
    {
        public orientation direction;
        public double distance;
    }

    class Program
    {
        static void Main(string[] args)
        {
            route myRoute;
            int myDirection;
            double myDistance;
            Console.WriteLine(" 1>北 \n 2>南 \n 3>东 \n 4>西");
            do
            {
                Console.WriteLine("select a direction:");
                myDirection = Convert.ToInt32(Console.ReadLine());
            } while ((myDirection<1||myDirection>4));
            Console.WriteLine("input a distance:");
            myDistance = Convert.ToDouble(Console.ReadLine());
            myRoute.direction = (orientation)myDirection;
            myRoute.distance = myDistance;
            Console.WriteLine("my specifies a diretion of {0} and a " + "distance of {1}", myRoute.direction, myRoute.distance);
            Console.ReadKey();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] friendNames = { "yaobao", "beijing", "meinv" };
            Console.WriteLine("here are {0} of my friend:", friendNames.Length);
            for (int i = 0; i < friendNames.Length; i++)
            {
                Console.WriteLine(friendNames[i]);
            }
            Console.ReadKey();
        }
    }
}