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.TH ISUNORDERED 3M "Jul 12, 2006" "SunOS 5.11" "Mathematical Library Functions"
.SH NAME
isunordered \- test if arguments are unordered
.SH SYNOPSIS
.LP
.nf
c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
#include <math.h>

\fBint\fR \fBisunordered\fR(\fBreal-floating\fR \fIx\fR, \fBreal-floating\fR \fIy\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBisunordered()\fR macro determines whether its arguments are unordered.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, the \fBisunordered()\fR macro returns 1 if its
arguments are unordered and 0 otherwise.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH USAGE
.sp
.LP
The relational and equality operators support the usual mathematical
relationships between numeric values. For any ordered pair of numeric values,
exactly one of the relationships (less, greater, and equal) is true. Relational
operators can raise the invalid floating-point exception when argument values
are NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered
relationship is true. This macro is a quiet (non-floating-point exception
raising) version of a relational operator. It facilitates writing efficient
code that accounts for quiet NaNs without suffering the invalid floating-point
exception. In the \fBSYNOPSIS\fR section, \fBreal-floating\fR indicates that
the argument shall be an expression of \fBreal-floating\fR type.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab(	) box;
cw(2.75i) |cw(2.75i)
lw(2.75i) |lw(2.75i)
.
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBisgreater\fR(3M), \fBisgreaterequal\fR(3M), \fBisless\fR(3M),
\fBislessequal\fR(3M), \fBislessgreater\fR(3M), \fBmath.h\fR(3HEAD),
\fBattributes\fR(5), \fBstandards\fR(5)