

 
Manual Reference Pages  REMAINDERF (3)
NAME
remainder,
remainderf,
remainderl,
remquo,
remquof,
remquol
 minimal residue functions
CONTENTS
Library
Synopsis
Description
See Also
Standards
History
LIBRARY
.Lb libm
SYNOPSIS
.In math.h
double
remainder double x double y
float
remainderf float x float y
long double
remainderl long double x long double y
double
remquo double x double y int *quo
float
remquof float x float y int *quo
long double
remquol long double x long double y int *quo
DESCRIPTION
remainder,
remainderf,
remainderl,
remquo,
remquof,
and
remquol
return the remainder
r
:=
x

n*y
where
n
is the integer nearest the exact value of
.Bk words
x / y;
.Ek
moreover if
 n

.Sm off
x / y 
.Sm on
=
1/2
then
n
is even.
Consequently
the remainder is computed exactly and
.Sm off
 r 
.Sm on
<=
.Sm off
 y /2.
.Sm on
But attempting to take the remainder when
y
is 0 or
x
is ±oo is an invalid operation that produces a NaN.
The
remquo,
remquof,
and
remquol
functions also store the last
k
bits of
n
in the location pointed to by
quo,
provided that
n
exists.
The number of bits
k
is platformspecific, but is guaranteed to be at least 3.
SEE ALSO
fmod(3),
ieee(3),
math(3)
STANDARDS
The
remainder,
remainderf,
remainderl,
remquo,
remquof,
and
remquol
routines conform to
isoC99.
The remainder is as defined in
ieee754.
HISTORY
The
remainder
and
remainderf
functions appeared in
BSD 4.3
and
.Fx 2.0 ,
respectively.
The
remquo
and
remquof
functions were added in
.Fx 6.0 ,
and
remainderl
and
remquol
were added in
.Fx 8.0 .
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