a,b值互换（不用第三方变量）

效果： 输出值： 源码：`static void Main(string[] args) { //Test1(10,20); //Test2(5, 9); //TestMaoPao(); TestMaoPaoZA(); }

/// <summary> /// 方式一 /// int a ,int b 已经赋值，不用其他变量，把它们的值互换！ /// </summary> public static void Test1(int a,int b) { //int a = 10; //int b = 15; Console.WriteLine("互换前 a 为:" + a); Console.WriteLine("互换前 b 为:" + b); Console.WriteLine("·························"); a = a + b; b = a + b; a = b - a; b = b - (2 * a); Console.WriteLine("互换后 a 为:" + a); Console.WriteLine("互换后 b 为:" + b); Console.Read(); Console.WriteLine("·························"); } /// <summary> /// 方式二 /// int a ,int b 已经赋值，不用其他变量，把它们的值互换！ /// </summary> public static void Test2(int c,int d) { Console.WriteLine("互换前 a 为:" + c); Console.WriteLine("互换前 b 为:" + d); Console.WriteLine("·························"); c = c + d; d = c - d; c = c - d; Console.WriteLine("互换后 a 为:" + c); Console.WriteLine("互换后 b 为:" + d); Console.Read(); Console.WriteLine("·························"); }