2004-06-30 07:04:01 +00:00
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.\" Copyright (c) 2004 David Schultz <das@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 29, 2004
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.Dt FDIM 3
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.Os
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.Sh NAME
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.Nm fdim ,
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.Nm fdimf ,
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.Nm fdiml
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.Nd positive difference functions
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.Sh LIBRARY
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.Lb libm
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.Sh SYNOPSIS
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.In math.h
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.Ft double
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.Fn fdim "double x" "double y"
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.Ft float
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.Fn fdimf "float x" "float y"
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.Ft long double
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.Fn fdiml "long double x" "long double y"
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.Sh DESCRIPTION
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The
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.Fn fdim ,
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.Fn fdimf ,
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and
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.Fn fdiml
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functions return the positive difference between
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.Fa x
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and
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.Fa y .
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That is, if
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.Fa x\- Ns Fa y
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is positive, then
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.Fa x\- Ns Fa y
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is returned.
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If either
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.Fa x
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or
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.Fa y
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is an \*(Na, then an \*(Na is returned.
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Otherwise, the result is
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.Li +0.0 .
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.Pp
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2010-08-16 15:18:30 +00:00
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Overflow or underflow may occur if the exact result is not
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2004-06-30 07:04:01 +00:00
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representable in the return type.
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No other exceptions are raised.
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.Sh SEE ALSO
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.Xr fabs 3 ,
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.Xr fmax 3 ,
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.Xr fmin 3 ,
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.Xr math 3
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.Sh STANDARDS
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The
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.Fn fdim ,
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.Fn fdimf ,
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and
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.Fn fdiml
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functions conform to
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.St -isoC-99 .
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.Sh HISTORY
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These routines first appeared in
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.Fx 5.3 .
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