NAME

signbit —

determine whether a floating-point number's sign is negative

LIBRARY

Math Library (libm, -lm)

#include <math.h>

int
signbit(real-floating x);

The signbit() macro takes an argument of x and returns non-zero if the value of its sign is negative, otherwise 0.

The signbit() macro conforms to ISO/IEC 9899:1999 (“ISO C99”).

The signbit() macro was added in FreeBSD 5.1.

July 18, 2004

FreeBSD 13.1-RELEASE

Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.