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+.\"	$OpenBSD: fmod.3,v 1.14 2025/06/07 10:33:06 schwarze Exp $
+.\" Copyright (c) 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)fmod.3	5.1 (Berkeley) 5/2/91
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt FMOD 3
+.Os
+.Sh NAME
+.Nm fmod ,
+.Nm fmodf ,
+.Nm fmodl
+.Nd floating-point remainder functions
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn fmod "double x" "double y"
+.Ft float
+.Fn fmodf "float x" "float y"
+.Ft long double
+.Fn fmodl "long double x" "long double y"
+.Sh DESCRIPTION
+The
+.Fn fmod
+function computes the floating-point remainder of
+.Fa x Ns / Ns Fa y .
+The
+.Fn fmodf
+function is a single precision version of
+.Fn fmod .
+The
+.Fn fmodl
+function is an extended precision version of
+.Fn fmod .
+.Sh RETURN VALUES
+The
+.Fn fmod ,
+.Fn fmodf
+and
+.Fn fmodl
+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
+function returns zero is implementation-defined.
+.Sh SEE ALSO
+.Xr remainder 3
+.Sh STANDARDS
+The
+.Fn fmod
+function conforms to
+.St -ansiC .
+.Sh HISTORY
+An
+.Fn fmod
+function first appeared in
+.At v5 .