using System;
using System.Collections;
using System.Linq;
using System.Text;

namespace chapter1
{

    class chapter1
    {
        static void Main(string[] args)
        {
            int num1 = 100;
            int num2 = 200;
            Console.WriteLine("num1: " + num1);
            Console.WriteLine("num2: " + num2);
            Swap<int>(ref num1, ref num2);
            Console.WriteLine("num1: " + num1);
            Console.WriteLine("num2: " + num2);
            string str1 = "Sam";
            string str2 = "Tom";
            Console.WriteLine("String 1: " + str1);
            Console.WriteLine("String 2: " + str2);
            Swap<string>(ref str1, ref str2);
            Console.WriteLine("String 1: " + str1);
            Console.WriteLine("String 2: " + str2);
            Console.ReadKey();
        }
        static void Swap<T>(ref T val1, ref T val2)
        {
            T temp;
            temp = val1;
            val1 = val2;
            val2 = temp;
        }
    }
}