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

Guardian Native C Library Calls (g - i) isinf(3)
NAME
isinf - Tests for infinity
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 isinf(
floating-type x);
PARAMETERS
floating-type Specifies the floating-type of x.
x Specifies a value of type floating-type.
DESCRIPTION
The isinf() macro determines whether its argument has an infinity. 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 isinf() macro returns a nonzero value if x is positive or negative infinity.
ERRORS
No errors are defined.
RELATED INFORMATION
Functions: fpclassify(3), isfinite(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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