Calendar Functions (simpler leap year calculation)

[Daniel R. Levy]

In article <886 at ihdev.UUCP>, pdg at ihdev.UUCP (P. D. Guthrie) writes:
>>Or if you want a simple cpp macro:
>>
>>#define  isleapyear(year)   ((year)%4)
>>
>>Bob Devine
>
>Or if you want a complex cpp macro
>to return the number of days in a year......
>
>#define num_day(x) ((x)%4 ? (x)%100 ? (x)%400 ? 366 : 355 : 356 : 355)
                                                       ^^^   ^^^   ^^^

Huh?
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