.\" Copyright (c) 1991 The Regents of the University of California.
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.\"     from: @(#)fmod.3	5.1 (Berkeley) 5/2/91
.\" $FreeBSD: src/lib/msun/man/fmod.3,v 1.8 2001/10/13 12:23:23 bde Exp $
.\"
.Dd May 2, 1991
.Dt FMOD 3
.Os
.Sh NAME
.Nm fmod ,
.Nm fmodf
.Nd floating-point remainder functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn fmod "double x" "double y"
.Ft float
.Fn fmodf "float x" "float y"
.Sh DESCRIPTION
The
.Fn fmod
and the
.Fn fmodf
functions compute the floating-point remainder of
.Fa x Ns / Fa y .
.Sh RETURN VALUES
The
.Fn fmod
and the
.Fn fmodf
functions return the value
.Sm off
.Fa x - Em i * Fa y ,
.Sm on
for some integer
.Em i
such that, if
.Fa y
is non-zero, the result has the same sign as
.Fa x
and magnitude less than the magnitude of
.Fa y .
If
.Fa y
is zero, whether a domain error occurs or the
.Fn fmod
and the
.Fn fmodf
function returns zero is implementation-defined.
.Sh SEE ALSO
.Xr math 3
.Sh STANDARDS
The
.Fn fmod
function conforms to
.St -isoC .