using System;
namespace P4_7
{
    class Program
    {
        static void Main(string[] args)
        {
	      //ͱ
            int mainX = 168;
            int mainY = 861;
            Console.WriteLine("ú֮ǰֵǣmainX= {0}  mainY={1} ", mainX, mainY);
            //ý
            swap(ref mainX,ref mainY );   
            //ͱֵ
            Console.WriteLine("úֵ֮ǣmainX= {0}  mainY={1} ", mainX, mainY);
            Console.ReadLine();

        }
        static void swap( ref int x, ref  int y) 
        { 
            int temp = x; 
            x = y;
            y = temp;
            Console.WriteLine("ڱֵǣx={0}   y={1}",x,y);
        }
    }
}
