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signbit(3m) [opensolaris man page]

signbit(3M)						  Mathematical Library Functions					       signbit(3M)

NAME
signbit - test sign SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> int signbit(real-floating x); DESCRIPTION
The signbit() macro determines whether the sign of its argument value is negative. NaNs, zeros, and infinities have a sign bit. RETURN VALUES
The signbit() macro returns a non-zero value if and only if the sign of its argument value is negative. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 signbit(3M)

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isinf(3M)						  Mathematical Library Functions						 isinf(3M)

NAME
isinf - test for infinity SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> int isinf(real-floating x); DESCRIPTION
The isinf() macro determines 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. RETURN VALUES
The isinf() macro returns a non-zero value if and only if its argument has an infinite value. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
fpclassify(3M), isfinite(3M), isnan(3M), isnormal(3M), math.h(3HEAD), signbit(3M), attributes(5), standards(5) SunOS 5.11 17 Nov 2008 isinf(3M)
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