Copyright 2001 Andries Brouwer <firstname.lastname@example.org>. and Copyright 2008, Linux Foundation, written by Michael Kerrisk <email@example.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived wor...
NAMEfloor, floorf, floorl - largest integral value not greater than argument
#include <math.h> double floor(double x);
float floorf(float x);
long double floorl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTIONThese functions return the largest integral value that is not greater than x.
For example, floor(0.5) is 0.0, and floor(-0.5) is -1.0.
RETURN VALUEThese functions return the floor of x.
If x is integral, +0, -0, NaN, or an infinity, x itself is returned.
ERRORSNo errors occur. POSIX.1-2001 documents a range error for overflows, but see NOTES.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|floor(), floorf(), floorl()||Thread safety||MT-Safe|
CONFORMING TOC99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.