Tribblix: manual page: llrint.3m

LLRINT(3M) Mathematical Library Functions LLRINT(3M)

NAME

llrint, llrintf, llrintl - round to nearest integer value using
current rounding direction

SYNOPSIS

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

long long llrint(double x);

long long llrintf(float x);

long long llrintl(long double x);

DESCRIPTION

These functions round their argument to the nearest integer value,
rounding according to the current rounding direction.

RETURN VALUES

Upon successful completion, these functions return the rounded
integer value.

If x is NaN, a domain error occurs and an unspecified value is
returned.

If x is +Inf, a domain error occurs and an unspecified value is
returned.

If x is -Inf, a domain error occurs and an unspecified value is
returned.

If the correct value is positive and too large to represent as a long
long, a domain error occurs and an unspecified value is returned.

If the correct value is negative and too large to represent as a
long long, a domain error occurs and an unspecified value is
returned.

ERRORS

These functions will fail if:

Domain Error
The x argument is NaN or +-Inf, or the correct value
is not representable as an integer.

If the integer expression (math_errhandling &
MATH_ERREXCEPT) is non-zero, then the invalid
floating-point exception will be raised.

USAGE

An application wanting to check for exceptions should call
feclearexcept(FE_ALL_EXCEPT) before calling these functions. On
return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW |
FE_UNDERFLOW) is non-zero, an exception has been raised. An
application should either examine the return value or check the
floating point exception flags to detect exceptions.

These functions provide floating-to-integer conversions. They round
according to the current rounding direction. If the rounded value is
outside the range of the return type, the numeric result is
unspecified and the invalid floating-point exception is raised. When
they raise no other floating-point exception and the result differs
from the argument, they raise the inexact floating-point exception.

ATTRIBUTES