给定一年，判断该年是否是闰年，并根据给出的月份判断是什么季节和该月有多少天。是自学Visual Basic 6.0程序设计语言语法和操作环境的初学者学习添加工具箱控件、添加菜单项和添加对话框等操作的比较有用的小程序。-Given year, the judge of the year is a leap year, and according to the given month to determine the season and the number of days of the mont