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

sqrtl(3) Guardian Native C Library Calls Reference Manual
NAME
sqrtl - Computes the square root of a long double number
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 sqrtl(
long double x);
PARAMETERS
x Is the long double value whose square root is to be computed.
DESCRIPTION
The sqrtl() function is a long double version of the sqrt() function; it takes a long double argu-
ment and returns a long double result.
The sqrtl() function computes the square root of its parameter.
NOTES
This function supports both IEEE Std 754-1985 floating-point and Tandem floating-point values
in the native environment. IEEE values can include NaN, and infinity and the sign of 0.0 (zero)
can be positive or negative. The class of an IEEE floating-point value can be determined using
the fp_class() function. Refer to the fp_class(3) reference page for a description of IEEE value
classes.
Guardian functions are available to convert between floating-point formats. Refer to the Guar-
dian Programmer’s Guide for a discussion of floating-point conversions.
RETURN VALUES
The sqrtl() function returns the square root of x. The value of x must be positive or zero.
For IEEE floating-point data, if the value of x is NaN, NaN is returned. If the value of x is nega-
tive, NaN is returned and errno is set to [EDOM]. If the value of x is positive infinity, positive
infinity is returned.
For Tandem floating-point data, if the value of x is negative, 0.0 (zero) is returned and errno is
set to [EDOM].
ERRORS
If any of the following conditions occurs, the sqrtl() function sets errno to the corresponding
value:
[EDOM] The value of the x parameter is negative.
RELATED INFORMATION
Functions: exp(3), fp_class(3), isnan(3), sqrt(3), sqrtf(3).
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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