Guardian Native C Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

roundl(3) Guardian Native C Library Calls Reference Manual
NAME
roundl - Rounds long double number to nearest integer value in floating-point format
LIBRARY
H-series and J-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL
32-bit H-series and J-series OSS processes: /G/system/zdllnnn/zcredll
64-bit H-series and J-series OSS processes: /G/system/zdllnnn/ycredll
SYNOPSIS
#include <math.h>
long double roundl(
long double x);
PARAMETERS
x Is the long double value to be rounded.
DESCRIPTION
The roundl( ) function is a long double version of the round( ) function; it takes a long double
argument and returns a long double result.
The roundl( ) function rounds the value of the x parameter to the nearest integer value in
floating-point format. If the value of x is exactly halfway between two integers, the result is
rounded away from zero, regardless of the current rounding direction.
NOTES
This function is implemented only for the IEEE_float floating-point option. Applications using
this function cannot be compiled if the specified floating-point option is Tandem_float.
RETURN VALUES
On successful completion, the function returns the rounded integer value in floating-point format.
If the value of x is NaN, the function returns NaN.
If the value of x is positive or negative zero, the function returns x.
If the value of x is positive or negative infinity, the function returns x.
If the correct value would cause overflow, the function returns HUGE_VALL (with the same
sign as x) and sets errno to [ERANGE].
ERRORS
If the following condition exists, the roundl( ) function sets errno to the corresponding value:
[ERANGE] The result would cause overflow.
RELATED INFORMATION
Functions: ceil(3), fabs(3), fegetround(3), fesetround(3), floor(3), fmod(3), lrint(3), llrint(3),
lround(3), llround(3), rint(3), round(3), roundf(3), trunc(3).
Files: math(4).
STANDARDS CONFORMANCE
This function conforms to the ISO/IEC 9899:1999 standard.
This function conforms to the IEEE Std 1003.1, 2004 Edition.
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