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(10,5);
        }
        /// <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(10,5);
        }
            /// <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