using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Review
{
class Program
{
static void Main(string[] args)
{
#region 1、声明两个变量int n1 = 10,n2 = 20;要求将这两个变量交换,最后输出 n1 = 20,n2 = 10;
//int n1 = 10;
//int n2 = 20;
//int temp = n1;
//n1 = n2;
//n2 = temp;
//Console.WriteLine("n1={0},n2={1}", n1, n2);
//Console.ReadKey();
//2、不使用第三个变量,将n1、n2交换
//int n1 = 10, n2 = 20;