NAME
isinf() — floating-point test for infinity
SYNOPSIS
#include <math.h>
int isinf(
floating-type
x);
DESCRIPTION
The
isinf()
macro determines whether its argument value is an infinity.
The macro can be used with either
double
or
float
arguments.
To use this macro, link in the math library by specifying
-lm
on the compiler or linker command line.
The
isinf()
macro replaces the
isinf()
and
isinff()
functions, which are obsolete and are no longer supported.
RETURN VALUE
The
isinf()
macro returns a nonzero value if
x
is
±INFINITY.
Otherwise it returns zero.
EXAMPLE
Take certain actions if
x
is infinity:
#include <math.h>
/*...*/
float x;
/*...*/
if (isinf(x))
/*...*/
ERRORS
No errors are defined.
Printable version
