Originální popis anglicky:
isinf - test for infinity
Návod, kniha: POSIX Programmer's Manual
#include <math.h>
int isinf(real-floating
x);
The
isinf() macro shall determine whether its argument value is an
infinity (positive or negative). First, an argument represented in a format
wider than its semantic type is converted to its semantic type. Then
determination is based on the type of the argument.
The
isinf() macro shall return a non-zero value if and only if its
argument has an infinite value.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
fpclassify() ,
isfinite() ,
isnan() ,
isnormal() ,
signbit() , the Base Definitions volume of
IEEE Std 1003.1-2001
<math.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
