闰年由两部分组成,一,能被4整除y%4==0 (A)但不能被100整除y%100 != 0 (B);二,能被400整除y%400 == 0 (C)

(一) + (二)

 

逻辑应是A*B + C

(A&&B) || C

( (y%4==0)&&(y%100 != 0) ) || (y%400 == 0)

 

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