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'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: GPL-1.0-or-later
.\"
.TH fmax 3 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
fmax, fmaxf, fmaxl \- determine maximum of two floating-point numbers
.SH LIBRARY
Math library
.RI ( libm ,\~ \-lm )
.SH SYNOPSIS
.nf
.B #include <math.h>
.P
.BI "double fmax(double " x ", double " y );
.BI "float fmaxf(float " x ", float " y );
.BI "long double fmaxl(long double " x ", long double " y );
.fi
.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.P
.BR fmax (),
.BR fmaxf (),
.BR fmaxl ():
.nf
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
.fi
.SH DESCRIPTION
These functions return the larger value of
.I x
and
.IR y .
.SH RETURN VALUE
These functions return the maximum of
.I x
and
.IR y .
.P
If one argument is a NaN, the other argument is returned.
.P
If both arguments are NaN, a NaN is returned.
.SH ERRORS
No errors occur.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR fmax (),
.BR fmaxf (),
.BR fmaxl ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
glibc 2.1.
C99, POSIX.1-2001.
.SH SEE ALSO
.BR fdim (3),
.BR fmin (3)
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