Linux 2.6 - man page for signbit (linux section 3posix)
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SIGNBIT(P) POSIX Programmer's Manual SIGNBIT(P)
signbit - test sign
int signbit(real-floating x);
The signbit() macro shall determine whether the sign of its argument value is negative.
NaNs, zeros, and infinities have a sign bit.
The signbit() macro shall return a non-zero value if and only if the sign of its argument
value is negative.
No errors are defined.
The following sections are informative.
fpclassify() , isfinite() , isinf() , isnan() , isnormal() , 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 SIGNBIT(P)
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