Copyright (c) 2003 David Schultz <das@FreeBSD.org>
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2. Redistributions in binary form must reproduce the above copyright
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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)
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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SUCH DAMAGE.
$FreeBSD: stable/11/lib/libc/gen/isgreater.3 327661 2018-01-07 00:38:34Z eadler $
.Dd February 12, 2003 .Dt ISGREATER 3 .Os .Sh NAME .Nm isgreater , isgreaterequal , isless , islessequal , .Nm islessgreater , isunordered .Nd "compare two floating-point numbers" .Sh LIBRARY .Lb libc .Sh SYNOPSIS n math.h .Ft int .Fn isgreater "real-floating x" "real-floating y" .Ft int .Fn isgreaterequal "real-floating x" "real-floating y" .Ft int .Fn isless "real-floating x" "real-floating y" .Ft int .Fn islessequal "real-floating x" "real-floating y" .Ft int .Fn islessgreater "real-floating x" "real-floating y" .Ft int .Fn isunordered "real-floating x" "real-floating y" .Sh DESCRIPTION Each of the macros .Fn isgreater , .Fn isgreaterequal , .Fn isless , .Fn islessequal , and .Fn islessgreater take arguments .Fa x and .Fa y and return a non-zero value if and only if its nominal relation on .Fa x and .Fa y is true. These macros always return zero if either argument is not a number (NaN), but unlike the corresponding C operators, they never raise a floating point exception.
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.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
$FreeBSD: stable/11/lib/libc/gen/isgreater.3 327661 2018-01-07 00:38:34Z eadler $
.Dd February 12, 2003 .Dt ISGREATER 3 .Os .Sh NAME .Nm isgreater , isgreaterequal , isless , islessequal , .Nm islessgreater , isunordered .Nd "compare two floating-point numbers" .Sh LIBRARY .Lb libc .Sh SYNOPSIS n math.h .Ft int .Fn isgreater "real-floating x" "real-floating y" .Ft int .Fn isgreaterequal "real-floating x" "real-floating y" .Ft int .Fn isless "real-floating x" "real-floating y" .Ft int .Fn islessequal "real-floating x" "real-floating y" .Ft int .Fn islessgreater "real-floating x" "real-floating y" .Ft int .Fn isunordered "real-floating x" "real-floating y" .Sh DESCRIPTION Each of the macros .Fn isgreater , .Fn isgreaterequal , .Fn isless , .Fn islessequal , and .Fn islessgreater take arguments .Fa x and .Fa y and return a non-zero value if and only if its nominal relation on .Fa x and .Fa y is true. These macros always return zero if either argument is not a number (NaN), but unlike the corresponding C operators, they never raise a floating point exception.
p The .Fn isunordered macro takes arguments .Fa x and .Fa y and returns non-zero if and only if any of .Fa x or .Fa y are NaNs. For any pair of floating-point values, one of the relationships (less, greater, equal, unordered) holds. .Sh SEE ALSO .Xr fpclassify 3 , .Xr math 3 , .Xr signbit 3 .Sh STANDARDS The .Fn isgreater , .Fn isgreaterequal , .Fn isless , .Fn islessequal , .Fn islessgreater , and .Fn isunordered macros conform to .St -isoC-99 . .Sh HISTORY The relational macros described above first appeared in .Fx 5.1 .