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

Guardian Native C Library Calls (g - i) isfinite(3)
NAME
isfinite - Tests for finite 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>
int isfinite(
floating-type x);
PARAMETERS
floating-type Specifies the floating-type of x.
x Specifies a value of type floating-type.
DESCRIPTION
The isfinite() macro determines whether its argument has a finite value (zero, denormalized, or
normalized, and not infinite or NaN). The argument must be of floating type, and classification is
based on the type of the argument.
NOTES
This macro is implemented only for the IEEE_float floating-point option. Applications using
this macro cannot be compiled if the specified floating-point option is Tandem_float.
RETURN VALUES
The isfinite() macro returns a nonzero value if and only if its argument has a finite value.
ERRORS
No errors are defined.
RELATED INFORMATION
Functions: fpclassify(3), isinf(3), isnan(3), isnormal(3), signbit(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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