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

Guardian Native C Library Calls (f) fdim(3)
NAME
fdim - Computes the positive difference between two floating-point 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>
double fdim(
double x,
double y
);
PARAMETERS
x Specifies a double value.
y Specifies a double value.
DESCRIPTION
The fdim() function computes the positive difference between x and y.Ifx is greater than y, x - y
is returned. If x is less than or equal to y, positive zero is returned.
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
Upon successful completion, the fdim( ) function returns the positive difference between x and y.
If x - y is positive and overflows, HUGE_VAL is returned and errno is set to [ERANGE].
If x - y is positive and underflows, 0.0 (zero) is returned.
If x or y is NaN, NaN is returned.
ERRORS
If any of the following conditions occurs, the fdim( ) function sets errno to the corresponding
value:
[ERANGE] The result would cause an overflow.
RELATED INFORMATION
Functions: fdimf(3), fdiml(3), fmin(3), fmax(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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