llround(3M) Mathematical Library Functions llround(3M)NAME
llround, llroundf, llroundl - round to nearest integer value
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
long long llround(double x);
long long llroundf(float x);
long long llroundl(long double x);
DESCRIPTION
These functions rounds their argument to the nearest integer value,
rounding halfway cases away from 0 regardless of 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 differ from the llrint(3M) functions in that the
default rounding direction for the llround() functions round halfway
cases away from 0 and need not raise the inexact floating-point excep‐
tion for non-integer arguments that round to within the range of the
return type.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfeclearexcept(3M), fetestexcept(3M), llrint(3M), lrint(3M), lround(3M),
math.h(3HEAD), attributes(5), standards(5)SunOS 5.11 12 Jul 2006 llround(3M)
