ISLESSGREATER(3P) POSIX Programmer's Manual ISLESSGREATER(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEislessgreater — test if x is less than or greater than y
int islessgreater(real-floating x, real-floating y);
The functionality described on this reference page is aligned with the
ISO C standard. Any conflict between the requirements described here
and the ISO C standard is unintentional. This volume of POSIX.1‐2008
defers to the ISO C standard.
The islessgreater() macro shall determine whether its first argument is
less than or greater than its second argument. The islessgreater(x, y)
macro is similar to (x) < (y) || (x) > (y); however, islessgreater(x,
y) shall not raise the invalid floating-point exception when x and y
are unordered (nor shall it evaluate x and y twice).
Upon successful completion, the islessgreater() macro shall return the
value of (x) < (y) || (x) > (y).
If x or y is NaN, 0 shall be returned.
No errors are defined.
The following sections are informative.
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 may raise the invalid floating-point excep‐
tion 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 NaNs
without suffering the invalid floating-point exception. In the SYNOPSIS
section, real-floating indicates that the argument shall be an expres‐
sion of real-floating type.
SEE ALSOisgreater(), isgreaterequal(), isless(), islessequal(), isunordered()
The Base Definitions volume of POSIX.1‐2008, <math.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
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