c

代码说明：

  c#代码，在程序主方法中，由用户依次输入月份和需要订购机票的数量，分别保存到整数变量month和sum中。 (c# code, the program' s main method, followed by the user to enter the month and the number of tickets need to be ordered, are saved to an integer variable month and the sum of.)