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

namespace _05不使用temp變數int型別資料交換
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入n1");
            int n1 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("請輸入n2");
            int n2 = Convert.ToInt32(Console.ReadLine());
            ExchangeTwoInt(ref n1, ref n2);
            Console.WriteLine("n1={0}",n1);
            Console.WriteLine("n2={0}",n2);
            Console.ReadKey();
        }

        //ref是把值傳遞轉換為引用傳遞，指向棧上的同一塊地址
        private static void ExchangeTwoInt(ref int n1, ref int n2)
        {
            n1 = n1 - n2;
            n2 = n1 + n2;//此時n2中存放的是n1的值
            //n1中要放n2的值 
            n1 = n2 - n1;
        }
    }
}