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-'\" t
-.\" Copyright 2003 Walter Harms, Andries Brouwer
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH fdim 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fdim, fdimf, fdiml \- positive difference
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double fdim(double " x ", double " y );
-.BI "float fdimf(float " x ", float " y );
-.BI "long double fdiml(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 fdimf (),
-.BR fdiml ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-These functions return the positive difference, max(\fIx\fP-\fIy\fP,0),
-between their arguments.
-.SH RETURN VALUE
-On success, these functions return the positive difference.
-.P
-If
-.I x
-or
-.I y
-is a NaN, a NaN is returned.
-.P
-If the result overflows,
-a range error occurs,
-and the functions return
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-or
-.BR HUGE_VALL ,
-respectively.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Range error: result overflow
-.I errno
-is set to
-.BR ERANGE .
-An overflow floating-point exception
-.RB ( FE_OVERFLOW )
-is raised.
-.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 fdim (),
-.BR fdimf (),
-.BR fdiml ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH BUGS
-Before glibc 2.24
-.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6796
-on certain architectures (e.g., x86, but not x86_64)
-these functions did not set
-.IR errno .
-.SH SEE ALSO
-.BR fmax (3)