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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

islessgreater(3M)

Name

islessgreater - test if x is less than or greater than y

Synopsis

c99 [ flag... ] file... –lm [ library... ]
#include <math.h>

int islessgreater(real-floating x, real-floating y);

Description

The islessgreater() macro determines 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) does not raise the invalid floating-point exception when x and y are unordered (nor does it evaluate x and y twice).

Return Values

Upon successful completion, the islessgreater() macro returns the value of (x) < (y) || (x) > (y).

If x or y is NaN, 0 is returned.

Errors

No errors are defined.

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 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 SYNOPSIS section, real-floating indicates that the argument is an expression of real-floating type.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

math.h(3HEAD), isgreater(3M), isgreaterequal(3M), isless(3M), islessequal(3M), isunordered(3M), attributes(7), standards(7)