C#练习题记录（交换两个数1)

 

声明两个变量：int n1 = 10, n2 = 20;要求将两个变量交换，最后输出n1为20,n2为10。　

在主函数中实现

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

namespace ConsoleApplication7
{
    
    class Program
    {
        static void Main(string[] args)
        {    int n1=10,n2=20;
            Console.WriteLine("交换前的n1={0},n2={1}",n1,n2);
            int c;
            c = n1;
            n1 = n2;
            n2 = c;;
            Console.WriteLine("交换后的n1={0},n2={1}",n1,n2);
            Console.ReadKey();

        }
    }
}

　　

不使用第三个变量进行交换两个数的值

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

namespace ConsoleApplication7
{
    
    class Program
    {
        static void Main(string[] args)
        {    int n1=10,n2=20;
            Console.WriteLine("交换前的n1={0},n2={1}",n1,n2);
            n1 = n1 ^ n2;
            n2 = n2 ^ n1;
            n1 =n1 ^n2;
            Console.WriteLine("交换后的n1={0},n2={1}",n1,n2);
            Console.ReadKey();

        }
    }
}

　　实现结果