The two are in an AND relationship, so the corresponding code is (year%100==0 && year%400!=0). The two situations a and b above are in an "OR" relationship, that is, if one of them is met, it is not a leap year. How to understand ytd and mtd indicators ytd (year to date) and mtd (month to date) are two time period indicators commonly used in financial analysis and business management. The understanding is as follows: 1. ytd (year to date) is determined.
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