HP-UX Reference (11i v2 07/12) - 3 Library Functions A-M (vol 6)

isless(3M) isless(3M)

NAME

isless() - ﬂoating-point quiet comparison macro (<)

SYNOPSIS

#include <math.h>

int isless(

ﬂoating-expr x, ﬂoating-expr

y);

DESCRIPTION

The isless() macro determines whether its ﬁrst argument is less than its second argument.

The value of isless(x,y)

is always equal to (x)<(y); however, unlike (x)<(

y),

isless(

x,y) does not raise the invalid exception when x and y are unordered.

The arguments must be of ﬂoating type. For Itanium(R)-based systems, the arguments can be any ﬂoating

type. For PA-RISC, each argument must be either

double or float.

USAGE

To use the

isless() macro, compile either with the default

-Ae option or with the -Aa and

-D_HPUX_SOURCE options. Make sure your program includes

<math.h>. Link in the math library by

specifying

-lm on the compiler or linker command line.

RETURN VALUE

The isless() macro returns the value of (x)<(y). The macro raises no ﬂoating-point exceptions.

ERRORS

No errors are deﬁned.