Create a function named setHoliday() that reads and displays the current list of holidays and then lets the user change,add,or delete holidays from the list. After a holiday has been modified, the function should sort the holidays and displays the new list. Finally, the function should ask the user whether the new list should be saved; if the user reponses affirmatively, the function should write the new data to the existing Holidays.txt file, overwriting the contents of the existing file.
假日列表存储在哪里呢？从该文件读取假日数据，存储到数组，然后提供增删改功能。最后将修改过的假日数据再存储到文件里
这个程序具体要求些什么，你给的只是描述。
比如初始有哪些holiday,
when user input what, change the list. eg: CHANGE *** **** or ..........