Calculates the maximum integer value less than x and x
long double __far floorl(long double x); (C99)
Returns the maximum integer value less than x and x.
If x is ±∞, floorl returns ±∞ and sets macro ERANGE to global variable errno.
If x is a Not-a-Number(NaN), floorl returns a Not-a-Number (NaN) and sets macro EDOM to global variable errno.
This function calculates the maximum integer value less than x and x.