\" $NetBSD: isgreater.3,v 1.1 2007/02/22 22:08:20 drochner Exp $
\"
\" Copyright (c) 2003 David Schultz <[email protected]>
\" All rights reserved.
\"
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\" FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/isgreater.3,v 1.3 2005/02/06 03:23:31 das Exp
\"
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
In 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.
Pp
The
Fn isunordered
macro takes arguments
Fa x
and
Fa y
and returns non-zero if and only if neither
Fa x
nor
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
Nx 5.0 .

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