Gregorian calendar leap year

I have to make a POSIX-friendly program in C that receiving a String it would test if the String is a valid gregorian calendar year and if it is a leap year.

My question is this: should I only consider years above 1582?

What context are you writing this program (or function) in? If it's built for recent dates, you might as well only consider years above 1900 or so; if you really need to support historical dates, you might start looking at some different calendar systems.

Also, a fun fact from the cal manpage (in fact, taking a look at cal's source code might be interesting):

The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the reformation (although a few did not recognize it until the early 1900's.) Ten days following that date were eliminated by the reformation, so the calendar for that month is a bit unusual.

>>2

well, my teacher said to program it in C.
we input a number/year and it should print it's a leap year in the gregorian calendar or not, and burst into flame if it's not a valid number/year.

So, by your input dear second poster, I should only accept years after 1752... because those years don't have missing days, right?

Your teacher wants you to use strftime and possibly strptime. Read the man pages and let the library implementers handle it.

Gregorian calendar is a Jewish invention

bampu pantsu