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 feclearex‐
cept(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 argu‐
ment, they raise the inexact floating-point exception.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
├─────────────────────────────┼─────────────────────────────┤
│Standard │See standards(5). │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfeclearexcept(3M), fetestexcept(3M), lrint(3M), math.h(3HEAD),
attributes(5), standards(5)SunOS 5.11 12 Jul 2006 llrint(3M)