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32.\" from: @(#)fmod.3 5.1 (Berkeley) 5/2/91
33.\" $Id: remainder.3,v 1.4 2004/12/20 21:35:46 scp Exp $
34.\"
35.Dd July 02, 2008
36.Dt REMAINDER 3
37.Os
38.Sh NAME
39.Nm remainder
40.Nd floating-point remainder function
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn remainder "double x" "double y"
45.Ft long double
46.Fn remainderl "long double x" "long double y"
47.Ft float
48.Fn remainderf "float x" "float y"
49.Sh DESCRIPTION
50The
51.Fn remainder
52functions compute the value r such that r = x - n*y, where n is the integer nearest the exact value of x/y.
53.Pp
54If there are two integers closest to x/y, n shall be the even one. If r is zero, it is given the same sign as x.
55.Sh SPECIAL VALUES
56.Fn remainder "x, y"
57returns a NaN and raises the "invalid" floating-point exception if x is infinite or y is 0.
58.Sh NOTE
59The
60.Fn drem
61function is deprecated. Please use the C99 function
62.Fn remainder
63instead.
64.Sh SEE ALSO
65.Xr math 3
66.Sh STANDARDS
67The
68.Fn remainder
69functions conform to ISO/IEC 9899:1999(E).