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FLOOR(3) Library Functions Manual FLOOR(3)

floor, floorf, floorl
round to largest integral value not greater than x

#include <math.h>
double
floor(double x);
float
floorf(float x);
long double
floorl(long double x);

The floor() function returns the largest integral value less than or equal to x. The floorf() function is a single precision version of floor(). The floorl() function is an extended precision version of floor().

abs(3), ceil(3), fabs(3), nextafter(3), rint(3)

The floor() function conforms to ANSI X3.159-1989 (“ANSI C89”).

A floor() function first appeared in Version 5 AT&T UNIX.
July 17, 2013 OpenBSD-current