Linux 2.6 - man page for isfinite (linux section 3posix)
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ISFINITE(P) POSIX Programmer's Manual ISFINITE(P)
isfinite - test for finite value
int isfinite(real-floating x);
The isfinite() macro shall determine whether its argument has a finite value (zero, sub-
normal, 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.
The isfinite() macro shall return a non-zero value if and only if its argument has a
No errors are defined.
The following sections are informative.
fpclassify() , isinf() , 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ISFINITE(P)
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