c# 变量交换

C#  变量交换

变量交换的方法：

1.借助第三个变量：

     class Program
     {
         static void Main(string[] args)
         {
             Exchage(,);
         }
         /// <summary>
         /// 交换变量,借助第三个变量
         /// </summary>
         /// <param name="num1"></param>
         /// <param name="num2"></param>
         private static void Exchage(int num1, int num2)
         {
             //交换前
             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
             int temp = num1;
             num1 = num2;
             num2 = temp;
             //交换后
             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
             Console.ReadKey();

         }
      }

2.累加法：

  class Program
     {
         static void Main(string[] args)
         {
             Exchage(,);
         }
             /// <summary>
         /// 交换变量，使用累加法
         /// </summary>
         /// <param name="num1"></param>
         /// <param name="num2"></param>
         private static void Exchage(int num1,int num2)
         {
             //交换前
              Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
             num1 = num1 + num2;
             num2 = num1 - num2;
             num1 = num1 - num2;
             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
             Console.ReadKey();

         }
     }

3.累减法，道理同累加法