C#函數的參數傳遞方式1（值傳遞與地址傳遞）

using System;
namespace class1
{
    class program
    {
        static void Main(string[] args)
        {
            //值傳遞引用，實際參數不會變化
            Console.Write("請輸入a=");
            double a = double.Parse(Console.ReadLine());
            Console.Write("請輸入b=");
            double b = double.Parse(Console.ReadLine());
            double c = max(a, b);//局部實際參數
            Console.WriteLine("您輸入的值中比較大的是{0}", c);
            //地址傳遞引用，實際參數會變化
            int[] ex = new int[4] { 1, 2, 3, 4 };
            Console.WriteLine("Before");
            foreach (var item in ex)
            {
                Console.Write("\t{0}", item);
            }
            dou(ex);
            Console.WriteLine("\nEnd");
            foreach (var item in ex)
            {
                Console.Write("\t{0}", item);
            }
        }
        /// <summary>
        /// 值傳遞
        /// </summary>
        /// <param name="a">形式參數（參數爲值類型）</param>
        /// <param name="b">形式參數（參數爲值類型）</param>
        /// <returns></returns>
        static double max(double a, double b)
        {//局部形式參數
            double c = a > b ? a : b;
            return c;
        }
        /// <summary>
        /// 地址傳遞
        /// </summary>
        /// <param name="array">數組參數（參數爲引用類型）</param>
        static void dou(int[] array)
        {
            for (int i = 0; i < array.Length; i++)
            {
                array[i] = array[i] * 2;
            }
        }
    }
}