闰年判断
一年中的第几天-闰年判断
class Solution { public: int dayOfYear(string date) { int ans = 0; bool isRun; int year = (date[0] - '0') * 1000 + (date[1] - '0') * 100 + (date[2] - '0') * 10 + (date[3] - '0') * 1; int month = (date[5] - '0') * 10 + (date[6] - '0') * 1; int day = (date[8] - '0') * 10 + (date[9] - '0') * 1; if (year % 4 == 0) { if (year % 100 == 0) { // // 这里如果被 400 整除是闰年 if (year % 400 == 0) isRun = 1; else isRun = 0; } else isRun = 1; } else isRun = 0; int lastday; for (int i = 1; i <= month; i++) { if (i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12) { ans += 31; lastday = 31; } else if (i == 2) { if (isRun) { ans += 29; lastday = 29; } else { ans += 28; lastday = 28; } } else { ans += 30; lastday = 30; } } ans -= (lastday - day); return ans; } };