signbit Macro
Purpose
Tests the sign.
Syntax
#include <math.h>
int signbit (x)
real-floating x;
Description
The signbit macro determines whether the sign of its argument value is negative. NaNs, zeros, and infinities have a sign bit.
Parameters
| Item | Description |
|---|---|
| x | Specifies the value to be tested. |
Return Values
The signbit macro returns a nonzero value if the sign of its argument value is negative.