@c ----------------------------------------------------------------------
@node floor, math
@subheading Syntax

@example
#include <math.h>

double floor(double x);
@end example

@subheading Description

This function computes the largest integer not greater than @var{x}.

@subheading Return Value

The largest integer value less than or equal to @var{x}.  Infinities and
@code{NaN}s are returned unchanged.

@subheading Portability

@portability ansi, posix