islessequal()

Updated: October 26, 2022

Determine whether one floating-point number is less than or equal to another

Synopsis:

#include <math.h>

#define islessequal( x, y  ) ...

Arguments:

x, y
The floating-point numbers that you want to compare.

Library:

libm
The general-purpose math library.
libm-sve
(QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

The islessequal() macro determines whether x is less than or equal to y. It's the same as (x) <= (y) but doesn't raise the invalid floating-point exception if x and y are unordered.

Returns:

The value of (x) <= (y). If x or y is NaN, this function returns 0.

Classification:

C11, POSIX 1003.1

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes