6章 函数

关键字 ref 的用法 

   class Class4
    {

         static void str(ref int s)
        {
            s = s * 2;
            Console.WriteLine("mynumber is {0}",s);
        }

        static void Main()
        {
             int mynum = 5;
            Console.WriteLine("mynumber{0}",mynum);
            str(ref mynum);
            Console.WriteLine("mynumber{0}", mynum);
        }
    }

 

结果

mynumber5
mynumber is 10
mynumber10