1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)fmod.3 5.1 (Berkeley) 5/2/91 33.\" $NetBSD: fmod.3,v 1.6 1998/02/05 18:52:04 perry Exp $ 34.\" 35.Dd May 2, 1991 36.Dt FMOD 3 37.Os 38.Sh NAME 39.Nm fmod 40.Nd floating-point remainder function 41.Sh LIBRARY 42.Lb libm 43.Sh SYNOPSIS 44.Fd #include <math.h> 45.Ft double 46.Fn fmod "double x" "double y" 47.Ft float 48.Fn fmodf "float x" "float y" 49.Sh DESCRIPTION 50The 51.Fn fmod 52function computes the floating-point remainder of 53.Fa x Ns / Fa y . 54.Sh RETURN VALUES 55The 56.Fn fmod 57and 58.Fn fmodf 59functions return the value 60.Sm off 61.Fa x - Em i * Fa y , 62.Sm on 63for some integer 64.Em i 65such that, if 66.Fa y 67is non-zero, the result has the same sign as 68.Fa x 69and magnitude less than the magnitude of 70.Fa y . 71If 72.Fa y 73is zero, whether a domain error occurs or the 74.Fn fmod 75function returns zero is implementation-defined. 76.Sh SEE ALSO 77.Xr math 3 78.Sh STANDARDS 79The 80.Fn fmod 81function conforms to 82.St -ansiC . 83