isfinite: test na konečnou hodnotu

Originální popis anglicky: isfinite - test for finite value

Návod, kniha: POSIX Programmer's Manual

STRUČNĚ

#include <math.h> int isfinite(real-floating x);

POPIS / INSTRUKCE

The isfinite() macro shall determine whether its argument has a finite value (zero, subnormal, or normal, and not infinite or NaN). 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.

NÁVRATOVÁ HODNOTA

The isfinite() macro shall return a non-zero value if and only if its argument has a finite value.

CHYBY / ERRORY

No errors are defined. The following sections are informative.

PŘÍKLADY POUŽITÍ

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SOUVISEJÍCÍ

fpclassify() , isinf() , isnan() , isnormal() , signbit() , the Base Definitions volume of IEEE Std 1003.1-2001 <math.h>

COPYRIGHT

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 .