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

Guardian Native C Library Calls (j - m) llround(3)
NAME
llround - Rounds floating-point number to nearest long long integer value
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 long int llround(
double x);
PARAMETERS
x Is the double value to be rounded.
DESCRIPTION
The llround() function rounds the value of the x parameter to the nearest long long integer
value. 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 long long integer value.
If the value of x is NaN, the function returns 0 (zero) and sets errno to [EDOM].
If the value of x is positive or negative infinity, the function returns LLONG_MAX or
LLONG_MIN and sets errno to [EDOM].
If the correct value is not representable as a long long integer, the function returns
LLONG_MAX or LLONG_MIN and sets errno to [EDOM].
ERRORS
If the following condition exists, the llround() function sets errno to the corresponding value:
[EDOM] The value of x is NaN, positive or negative infinity, or is not representable as a
long long integer.
RELATED INFORMATION
Functions: ceil(3), fabs(3), fegetround(3), fesetround(3), floor(3), fmod(3), lrint(3), llrint(3),
lround(3), llroundf(3), llroundl(3), nearbyint(3), rint(3), round(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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