1.\" $OpenBSD: isgreater.3,v 1.4 2017/08/29 15:03:37 millert Exp $ 2.\" 3.\" Copyright (c) 2003 David Schultz <das@FreeBSD.ORG> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/lib/libc/gen/isgreater.3,v 1.3 2005/02/06 03:23:31 das Exp $ 28.\" 29.Dd $Mdocdate: August 29 2017 $ 30.Dt ISGREATER 3 31.Os 32.Sh NAME 33.Nm isgreater , 34.Nm isgreaterequal , 35.Nm isless , 36.Nm islessequal , 37.Nm islessgreater , 38.Nm isunordered 39.Nd compare two floating-point numbers 40.Sh SYNOPSIS 41.In math.h 42.Ft int 43.Fn isgreater "real-floating x" "real-floating y" 44.Ft int 45.Fn isgreaterequal "real-floating x" "real-floating y" 46.Ft int 47.Fn isless "real-floating x" "real-floating y" 48.Ft int 49.Fn islessequal "real-floating x" "real-floating y" 50.Ft int 51.Fn islessgreater "real-floating x" "real-floating y" 52.Ft int 53.Fn isunordered "real-floating x" "real-floating y" 54.Sh DESCRIPTION 55Each of the macros 56.Fn isgreater , 57.Fn isgreaterequal , 58.Fn isless , 59.Fn islessequal , 60and 61.Fn islessgreater 62take arguments 63.Fa x 64and 65.Fa y 66and return a non-zero value if and only if its nominal 67relation on 68.Fa x 69and 70.Fa y 71is true. 72These macros always return zero if either 73argument is not a number (NaN), but unlike the corresponding C 74operators, they never raise a floating point exception. 75.Pp 76The 77.Fn isunordered 78macro takes arguments 79.Fa x 80and 81.Fa y 82and returns non-zero if at least one of the arguments is NaN. 83For any pair of floating-point values, one 84of the relationships (less, greater, equal, unordered) holds. 85.Sh SEE ALSO 86.Xr fpclassify 3 87.Sh STANDARDS 88The 89.Fn isgreater , 90.Fn isgreaterequal , 91.Fn isless , 92.Fn islessequal , 93.Fn islessgreater , 94and 95.Fn isunordered 96macros conform to 97.St -isoC-99 . 98.Sh HISTORY 99The relational macros described above first appeared in 100.Ox 4.4 . 101