说明：  题目：输入某年某月某日，判断这一天是这一年的第几天？1.程序分析：以3月5日为例，应该先把前两个月的加起来，然后再加上5天即本年的第几天，特殊 情况，闰年且输入月份大于3时需考虑多加一天。
(Topic: input once upon a time, a judge this day is a day of this person? 1. The program analysis: to March 5, for example, should put the first two months of together, and then add the five days that this year s first day, special circumstances, a leap year and more than 3 month input should be considered when one more day.)