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  11 .TH isunordered 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  12 .SH NAME
  13 isunordered \- test if arguments are unordered
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  18 #include <math.h>
  19 
  20 \fBint\fR \fBisunordered\fR(\fBreal-floating\fR \fIx\fR, \fBreal-floating\fR \fIy\fR);
  21 .fi
  22 
  23 .SH DESCRIPTION
  24 .sp
  25 .LP
  26 The \fBisunordered()\fR macro determines whether its arguments are unordered.
  27 .SH RETURN VALUES
  28 .sp
  29 .LP
  30 Upon successful completion, the \fBisunordered()\fR macro returns 1 if its
  31 arguments are unordered and 0 otherwise.
  32 .SH ERRORS
  33 .sp
  34 .LP
  35 No errors are defined.
  36 .SH USAGE
  37 .sp
  38 .LP
  39 The relational and equality operators support the usual mathematical
  40 relationships between numeric values. For any ordered pair of numeric values,
  41 exactly one of the relationships (less, greater, and equal) is true. Relational
  42 operators can raise the invalid floating-point exception when argument values
  43 are NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered
  44 relationship is true. This macro is a quiet (non-floating-point exception
  45 raising) version of a relational operator. It facilitates writing efficient
  46 code that accounts for quiet NaNs without suffering the invalid floating-point
  47 exception. In the \fBSYNOPSIS\fR section, \fBreal-floating\fR indicates that
  48 the argument shall be an expression of \fBreal-floating\fR type.
  49 .SH ATTRIBUTES
  50 .sp
  51 .LP
  52 See \fBattributes\fR(5) for descriptions of the following attributes:
  53 .sp
  54 
  55 .sp
  56 .TS
  57 tab() box;
  58 cw(2.75i) |cw(2.75i) 
  59 lw(2.75i) |lw(2.75i) 
  60 .
  61 ATTRIBUTE TYPEATTRIBUTE VALUE
  62 _
  63 Interface StabilityStandard
  64 _
  65 MT-LevelMT-Safe
  66 .TE
  67 
  68 .SH SEE ALSO
  69 .sp
  70 .LP
  71 \fBisgreater\fR(3M), \fBisgreaterequal\fR(3M), \fBisless\fR(3M),
  72 \fBislessequal\fR(3M), \fBislessgreater\fR(3M), \fBmath.h\fR(3HEAD),
  73 \fBattributes\fR(5), \fBstandards\fR(5)