using System;

namespace prg1
{
  class Paramstest
  {  
    //值参数使用演示
    public static void Transposition_1(int a, int b)
    {
      int temp = a;
      a = b;
      b = temp;
    }
    //引用参数使用演示
    static void Transposition_2(ref int a,ref int b)
    {
      int temp = a;
      a = b;
      b = temp;
    }
    static void Main(string[] args)
    {
      int a = 25;
      int b = 30;
      //调用Transposition_1
      Console.WriteLine("调用Transposition_1之前a={0},b={1}",a,b);
      Transposition_1(a,b);
      Console.WriteLine("调用Transposition_1之后a={0},b={1}", a, b);
      Console.WriteLine("====================\n");
      //调用Transposition_2
      Console.WriteLine("调用Transposition_2之前a={0},b={1}", a, b);
      Transposition_2(ref a,ref b);
      Console.WriteLine("调用Transposition_2之后a={0},b={1}", a, b);
      Console.WriteLine("====================\n");
      Console.ReadKey();
    }
  }
}

static void Transposition_2(ref int a,ref int b)
    {
      int temp = a;
      a = b;
      b = temp;
    }

//Use of output parameters
    static void Transposition_3(string name,out string FistName,out string LastName)
    {
      int i=name.Length;//Get the length of the string
      while(i>0)
      {
       char chparm=name[i-1];
       if (chparm == '.')
       {
         break;
       }
       i--;
      }
      FistName = name.Substring(0,i-1);
      LastName = name.Substring(i);

    }
//调用Transposition_3
      string DoName,Nmark; 
      Transposition_3("rohelm.X",out DoName,out Nmark);
      Console.WriteLine("Domain Name of Myself: {0}",DoName);
      Console.WriteLine("The last name of my Domain Name: {0}",Nmark);

class Prmarry
  {
    public static void Show(params string[] name)
    {
      Console.WriteLine("Array contains the number of elements: {0}", name.Length);
      Console.Write("elements of NameArray:");
      for (int i = 0; i < name.Length; i++)
      {
        Console.Write("{0,10}",name[i]);
      }
    }
  }
//调用Show
      string[] NameArray = { "rohelm.X", "Boolean", "rrats" };
      Prmarry.Show(NameArray); 
      Console.ReadKey();

using System;

namespace prg1
{
  class Paramstest
  {  
    //值参数使用演示
    public static void Transposition_1(int a, int b)
    {
      int temp = a;
      a = b;
      b = temp;
    }
    //引用参数使用演示
    static void Transposition_2(ref int a,ref int b)
    {
      int temp = a;
      a = b;
      b = temp;
    }
    //Use of output parameters
    static void Transposition_3(string name,out string FistName,out string LastName)
    {
      int i=name.Length;//Get the length of the string
      while(i>0)
      {
       char chparm=name[i-1];
       if (chparm == '.')
       {
         break;
       }
       i--;
      }

      FistName = name.Substring(0, i - 1);
      LastName = name.Substring(i);
    }
    static void Main(string[] args)
    {
      int a = 25;
      int b = 30;
      //调用Transposition_1
      Console.WriteLine("调用Transposition_1之前a={0},b={1}",a,b);
      Transposition_1(a,b);
      Console.WriteLine("调用Transposition_1之后a={0},b={1}", a, b);
      Console.WriteLine("====================\n");
      //调用Transposition_2
      Console.WriteLine("调用Transposition_2之前a={0},b={1}", a, b);
      Transposition_2(ref a,ref b);
      Console.WriteLine("调用Transposition_2之后a={0},b={1}", a, b);
      Console.WriteLine("====================\n");
      //调用Transposition_3
      string DoName,Nmark; 
      Transposition_3("rohelm.X",out DoName,out Nmark);
      Console.WriteLine("Domain Name of Myself: {0}",DoName);
      Console.WriteLine("The last name of my Domain Name: {0}"+"\n",Nmark);
      //调用Show
      string[] NameArray = { "rohelm.X", "Boolean", "rrats" };
      Prmarry.Show(NameArray); 
      Console.ReadKey();
    }
  }
  class Prmarry
  {
    public static void Show(params string[] name)
    {
      Console.WriteLine("Array contains the number of elements: {0}", name.Length);
      Console.Write("elements of NameArray:");
      for (int i = 0; i < name.Length; i++)
      {
        Console.Write("{0,10}",name[i]);
      }
    }
  }
}