ISLESS(3M) Mathematical Library Functions ISLESS(3M)

NAME

isless - test if x is less than y

SYNOPSIS

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

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

DESCRIPTION

The isless() macro determines whether its first argument is less than
its second argument. The value of isless(x, y) is equal to (x) <
(y); however, unlike (x) < (y), isless(x, y) does not raise the
invalid floating-point exception when x and y are unordered.

RETURN VALUES

Upon successful completion, the isless() macro returns the value of
(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 | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+

SEE ALSO

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

SunOS 5.11 July 12, 2006 ISLESS(3M)