SIGNBIT(3) BSD Library Functions Manual SIGNBIT(3)NAMEsignbit — 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 ALSOfpclassify(3), math(3)STANDARDS
The signbit() macro conforms to ISO/IEC 9899:1999 (“ISO C99”).
BSD February 11, 2003 BSD