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.\" $FreeBSD$ 34.\" 35.Dd May 2, 1991 36.Dt FMOD 3 37.Os 38.Sh NAME 39.Nm fmod , 40.Nm fmodf 41.Nd floating-point remainder functions 42.Sh SYNOPSIS 43.Fd #include <math.h> 44.Ft double 45.Fn fmod "double x" "double y" 46.Ft float 47.Fn fmodf "float x" "float y" 48.Sh DESCRIPTION 49The 50.Fn fmod 51and the 52.Fn fmodf 53functions compute the floating-point remainder of 54.Fa x Ns / Fa y . 55.Sh RETURN VALUES 56The 57.Fn fmod 58and the 59.Fn fmodf 60functions return the value 61.Sm off 62.Fa x - Em i * Fa y , 63.Sm on 64for some integer 65.Em i 66such that, if 67.Fa y 68is non-zero, the result has the same sign as 69.Fa x 70and magnitude less than the magnitude of 71.Fa y . 72If 73.Fa y 74is zero, whether a domain error occurs or the 75.Fn fmod 76and the 77.Fn fmodf 78function returns zero is implementation-defined. 79.Sh SEE ALSO 80.Xr math 3 81.Sh STANDARDS 82The 83.Fn fmod 84function conforms to 85.St -isoC . 86