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signbit(3) [osx man page]

SIGNBIT(3)						   BSD Library Functions Manual 						SIGNBIT(3)

NAME
signbit -- determine whether a floating-point number's sign is negative LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <math.h> int signbit(real-floating x); DESCRIPTION
The signbit() macro takes an argument of x. It returns non-zero if the value of the argument's sign is negative, otherwise 0. SEE ALSO
fpclassify(3), math(3) STANDARDS
The signbit() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). BSD
February 11, 2003 BSD

Check Out this Related Man Page

signbit(3M)															       signbit(3M)

NAME
signbit() - floating-point sign-determination SYNOPSIS
floating-type DESCRIPTION
The macro determines whether the sign of its argument value (which may be a floating-point number, zero, infinity, or NaN) is negative. The argument must be of floating type. For HP Integrity servers, the argument can be any floating type. For PA-RISC, the argument must be either or USAGE
To use the macro, compile either with the default option or with the and options. Make sure your program includes Link in the math library by specifying on the compiler or linker command line. RETURN VALUE
The macro returns a nonzero value if and only if the sign of its argument value is negative. The macro raises no exceptions. ERRORS
No errors are defined. EXAMPLES
Take certain actions if is negative zero: SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math(5). STANDARDS CONFORMANCE
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'') signbit(3M)
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