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'\" et
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.TH ISUNORDERED "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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isunordered
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\(em test if arguments are unordered
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.SH SYNOPSIS
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.LP
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.nf
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#include <math.h>
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.P
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int isunordered(real-floating \fIx\fP, real-floating \fIy\fP);
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.fi
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.SH DESCRIPTION
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The functionality described on this reference page is aligned with the
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ISO\ C standard. Any conflict between the requirements described here and the
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ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.
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.P
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The
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\fIisunordered\fR()
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macro shall determine whether its arguments are unordered.
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.SH "RETURN VALUE"
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Upon successful completion, the
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\fIisunordered\fR()
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macro shall return 1 if its arguments are unordered, and 0 otherwise.
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.P
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If
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.IR x
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or
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.IR y
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is NaN, 1 shall be returned.
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.SH ERRORS
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No errors are defined.
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.LP
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.IR "The following sections are informative."
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.SH EXAMPLES
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None.
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.SH "APPLICATION USAGE"
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The relational and equality operators support the usual mathematical
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relationships between numeric values. For any ordered pair of numeric
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values, exactly one of the relationships (less, greater, and equal) is
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true. Relational operators may raise the invalid floating-point
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exception when argument values are NaNs. For a NaN and a numeric value,
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or for two NaNs, just the unordered relationship is true. This macro
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is a quiet (non-floating-point exception raising) version of a
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relational operator. It facilitates writing efficient code that
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accounts for NaNs without suffering the invalid floating-point
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exception. In the SYNOPSIS section,
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.BR real-floating
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indicates that the argument shall be an expression of
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.BR real-floating
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type.
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.SH RATIONALE
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None.
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.SH "FUTURE DIRECTIONS"
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None.
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.SH "SEE ALSO"
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.IR "\fIisgreater\fR\^(\|)",
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.IR "\fIisgreaterequal\fR\^(\|)",
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.IR "\fIisless\fR\^(\|)",
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.IR "\fIislessequal\fR\^(\|)",
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.IR "\fIislessgreater\fR\^(\|)"
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.P
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The Base Definitions volume of POSIX.1\(hy2008,
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.IR "\fB<math.h>\fP"
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 7, Copyright (C) 2013 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.unix.org/online.html .
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Any typographical or formatting errors that appear
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in this page are most likely
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to have been introduced during the conversion of the source files to
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man page format. To report such errors, see
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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