mirror of https://github.com/mkerrisk/man-pages
93 lines
1.9 KiB
Groff
93 lines
1.9 KiB
Groff
.\" Copyright 2003 Walter Harms, Andries Brouwer
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.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.TH FDIM 3 2013-07-15 "" "Linux Programmer's Manual"
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.SH NAME
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fdim, fdimf, fdiml \- positive difference
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.SH SYNOPSIS
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.B #include <math.h>
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.sp
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.BI "double fdim(double " x ", double " y );
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.br
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.BI "float fdimf(float " x ", float " y );
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.br
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.BI "long double fdiml(long double " x ", long double " y );
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.sp
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Link with \fI\-lm\fP.
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR fdimf (),
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.BR fdiml ():
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.RS 4
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_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
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_POSIX_C_SOURCE\ >=\ 200112L;
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.br
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or
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.I cc\ -std=c99
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.RE
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.ad
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.SH DESCRIPTION
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These functions return the positive difference, max(\fIx\fP-\fIy\fP,0),
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between their arguments.
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.SH RETURN VALUE
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On success, these functions return the positive difference.
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If
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.I x
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or
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.I y
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is a NaN, a NaN is returned.
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If the result overflows,
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a range error occurs,
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and the functions return
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.BR HUGE_VAL ,
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.BR HUGE_VALF ,
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or
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.BR HUGE_VALL ,
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respectively.
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.SH ERRORS
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See
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.BR math_error (7)
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for information on how to determine whether an error has occurred
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when calling these functions.
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.PP
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The following errors can occur:
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.TP
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Range error: result overflow
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.\" .I errno
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.\" is set to
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.\" .BR ERANGE .
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An overflow floating-point exception
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.RB ( FE_OVERFLOW )
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is raised.
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.PP
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These functions do not set
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.IR errno .
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.\" FIXME . Is it intentional that these functions do not set errno?
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.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6796
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.SH VERSIONS
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These functions first appeared in glibc in version 2.1.
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR fdim (),
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.BR fdimf (),
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and
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.BR fdiml ()
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functions are thread-safe.
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.SH CONFORMING TO
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C99, POSIX.1-2001.
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.SH SEE ALSO
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.BR fmax (3)
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