проверить, если x меньше или больше y (test if x is less than or greater than y)
Пролог (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.
Имя (Name)
islessgreater — test if x is less than or greater than y
Синопсис (Synopsis)
#include <math.h>
int islessgreater(real-floating x, real-floating y);
Описание (Description)
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.1‐2017 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).
Возвращаемое значение (Return value)
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.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
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 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
NaNs without suffering the invalid floating-point exception. In
the SYNOPSIS section, real-floating indicates that the argument
shall be an expression of real-floating type.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
isgreater(3p), isgreaterequal(3p), isless(3p), islessequal(3p),
isunordered(3p)
The Base Definitions volume of POSIX.1‐2017, math.h(0p)
