islessequal(3M) Mathematical Library Functions islessequal(3M)NAMEislessequal - test if x is less than or equal to y
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
int islessequal(real-floating x, real-floating y);
DESCRIPTION
The islessequal() macro determines whether its first argument is less
than or equal to its second argument. The value of islessequal(x, y) is
equal to (x) ≤ (y); however, unlike (x) ≤ (y), islessequal(x, y) does
not raise the invalid floating-point exception when x and y are
unordered.
RETURN VALUES
Upon successful completion, the islessequal() 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 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 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(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOisgreater(3M), isgreaterequal(3M), isless(3M), islessgreater(3M),
isunordered(3M), math.h(3HEAD), attributes(5), standards(5)SunOS 5.10 12 Jul 2006 islessequal(3M)