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

Guardian Native C Library Calls (g - i) hypotf(3)
NAME
hypotf - Computes the Euclidean distance function for float values
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>
float hypotf(
float x,
float y
);
PARAMETERS
x Specifies a float value.
y Specifies a float value.
DESCRIPTION
The hypotf() function is a float version of the hypot() function; it takes float arguments and
returns a float result.
The hypotf() function computes the length of the hypotenuse of a right-angled triangle with the
formula:
√
x*x+y*y
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 either positive or negative. 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
Upon successful completion, the hypotf() function returns the length of the hypotenuse.
If the correct result would cause overflow, HUGE_VALF is returned and errno is set to
[ERANGE]. If the correct result would cause underflow, 0.0 (zero) is returned.
For IEEE floating-point values, if the value of either x or y is NaN, NaN is returned.
ERRORS
If any of the following conditions occurs, the hypotf() function sets errno to the corresponding
value:
[ERANGE] The value to be returned would cause an overflow.
RELATED INFORMATION
Functions: exp(3), fp_class(3), hypot(3), hypotl(3), isnan(3), sqrt(3).
STANDARDS CONFORMANCE
This function conforms to the ISO/IEC 9899:1999 standard.
This function conforms to the IEEE Std 1003.1, 2004 Edition.
527192-018 Hewlett-Packard Company 3−89