aint(3M)aint(3M)NAME
aint, aintf, aintl, anint, anintf, anintl, irint, irintf, irintl, nint,
nintf, nintl - round to integral value in floating point or integer
format
SYNOPSIS
cc [ flag ... ] file ... -lsunmath -lm [ library ... ]
#include <sunmath.h>
double aint(double x);
float aintf(float x);
long double aintl(long double x);
double anint(double x);
float anintf(float x);
long double anintl(long double x);
int irint(double x);
int irintf(float x);
int irintl(long double x);
int nint(double x);
int nintf(float x);
int nintl(long double x);
DESCRIPTION
These functions round a floating point value x to one of the integers
nearest x.
aint(x) returns a floating point number equal to the nearest integer no
larger than x in absolute value. If x is NaN, aint(x) returns a NaN.
If x is infinite or is itself an integer, aint(x) returns x. Other‐
wise, the result has the same sign as x. aint() is equivalent to the
Fortran intrinsic function AINT(). It is also equivalent to the C99
function trunc() except that aint() always raises the inexact exception
when x is not an integer while trunc() need not.
anint(x) returns a floating point number equal to the nearest integer
to x; when x is exactly halfway between two integers, anint(x) returns
the larger of the two in absolute value. If x is NaN, anint(x) returns
a NaN. If x is infinite or is itself an integer, anint(x) returns x.
Otherwise, the result has the same sign as x. anint() is equivalent to
the Fortran intrinsic function ANINT(). It is also equivalent to the
C99 function round() except that anint() always raises the inexact
exception when x is not an integer while round() need not.
irint(x) rounds x to the nearest integer according to the current
rounding direction mode and converts the result to an int. If x is
NaN, infinite, or so large that the nearest integer would exceed the
range of the int type, an invalid operation exception occurs.
nint(x) rounds x to the nearest integer and converts the result to an
int; when x is exactly halfway between two integers, nint(x) selects
the larger of the two in absolute value. If x is NaN, infinite, or so
large that the nearest integer would exceed the range of the int type,
an invalid operation exception occurs. nint() is equivalent to the
Fortran intrinsic function NINT().
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Committed │
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOceil(3M), floor(3M), llrint(3M), llround(3M), lrint(3M), lround(3M),
nearbyint(3M), rint(3M), round(3M), trunc(3M), attributes(5)
14 Mar 2009 aint(3M)
