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32.\" from: @(#)fmod.3 5.1 (Berkeley) 5/2/91
33.\" $Id: fmod.3,v 1.4 2004/12/20 21:35:45 scp Exp $
34.\"
35.Dd December 11, 2006
36.Dt FMOD 3
37.Os
38.Sh NAME
39.Nm fmod
40.Nd floating-point remainder function
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn fmod "double x" "double y"
45.Ft long double
46.Fn fmodl "long double x" "long double y"
47.Ft float
48.Fn fmodf "float x" "float y"
49.Sh DESCRIPTION
50The
51.Fn fmod
52functions compute the floating-point remainder of
53.Fa x Ns / Fa y .
54.Pp
55Specifically, the functions return the value
56.Sm off
57.Fa x - Em i * Fa y ,
58.Sm on
59for some integer
60.Em i
61such that, if
62.Fa y
63is non-zero, the result has the same sign as
64.Fa x
65and magnitude less than the magnitude of
66.Fa y .
67.Sh SPECIAL VALUES
68.Fn fmod "�0, y"
69returns �0 if y is neither 0 nor NaN.
70.Pp
71.Fn fmod "x, y"
72returns a NaN and raises the "invalid" floating-point exception for x infinite or y zero.
73.Pp
74.Fn fmod "x, �infinity"
75returns x for x not infinite.
76.Sh SEE ALSO
77.Xr math 3
78.Sh STANDARDS
79The
80.Fn fmod
81functions conform to ISO/IEC 9899:1999(E).