此c++程序可以让使用者依次输入年份、月份、日期，并在输入的同时判断输入是否正确：比如闰年2月份有29日、4月份没有31日等，最后输出年月日以及该年是否是闰年。-This c++ program allows the user to turn the input year, month, date, and at the same time to determine the input type is correct: for example, a leap year February has 29, not 31, so in April, the final output of the year month, day, and whether leap year.