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isinf(3M)

HP-UX 11i Version 3: February 2007
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NAME

isinf() — floating-point test for infinity

SYNOPSIS

#include <math.h>

int isinf(floating-type x);

DESCRIPTION

The isinf() macro determines whether its argument is an infinity. The argument must be of floating type, and classification is based on the type of the argument. For HP Integrity servers, the argument can be any floating type. For PA-RISC, the argument must be either double or float.

The isinf() macro replaces the isinf() and isinff() functions, which are obsolete and are no longer supported.

USAGE

To use the isinf() macro, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. Make sure your program includes <math.h>. Link in the math library by specifying -lm on the compiler or linker command line.

RETURN VALUE

The isinf() macro returns a nonzero value if x is ±INFINITY. Otherwise, it returns zero. The macro raises no floating-point exceptions.

ERRORS

No errors are defined.

EXAMPLES

Take certain actions if x is infinity:

#include <math.h> /*...*/ float x; /*...*/ if (isinf(x)) /*...*/

STANDARDS CONFORMANCE

isinf(): ISO/IEC C99

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