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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.

FreeBSD 5.4			 July 18, 2004			   FreeBSD 5.4

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