变量交换

 1     class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             Exchage(10,5);
 6         }
 7         /// <summary>
 8         /// 交换变量,借助第三个变量
 9         /// </summary>
10         /// <param name="num1"></param>
11         /// <param name="num2"></param>
12         private static void Exchage(int num1, int num2)
13         {
14             //交换前
15             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
16             int temp = num1;
17             num1 = num2;
18             num2 = temp;
19             //交换后
20             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
21             Console.ReadKey();
22 
23         }
24      }

 1  class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             Exchage(10,5);
 6         }
 7             /// <summary>
 8         /// 交换变量，使用累加法
 9         /// </summary>
10         /// <param name="num1"></param>
11         /// <param name="num2"></param>
12         private static void Exchage(int num1,int num2)
13         {
14             //交换前
15              Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
16             num1 = num1 + num2;
17             num2 = num1 - num2;
18             num1 = num1 - num2;
19             Console.WriteLine("num1的值：{0}；num2的值：{1}", num1, num2);
20             Console.ReadKey();
21 
22         }
23     }