SIGNBIT(3) BSD Library Functions Manual SIGNBIT(3)NAME
signbit -- determine whether a floating-point number's sign is negative
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
int
signbit(real-floating x);
DESCRIPTION
The signbit() macro takes an argument of x and returns non-zero if the value of its sign is negative, otherwise 0.
SEE ALSO fpclassify(3), math(3)STANDARDS
The signbit() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
The signbit() macro was added in FreeBSD 5.1.
BSD July 18, 2004 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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