Namespaces
Variants
Views
Actions

signbit

From cppreference.com
< c‎ | numeric‎ | math
Revision as of 14:30, 10 May 2014 by Newatthis (Talk | contribs)

 
 
 
Common mathematical functions
Functions
Basic operations
(C99)
(C99)
(C99)
(C99)
(C99)
(C99)(C99)(C99)
Exponential functions
(C99)
(C99)
(C99)
(C99)
Power functions
(C99)
(C99)
Trigonometric and hyperbolic functions
(C99)
(C99)
(C99)
Error and gamma functions
(C99)
(C99)
(C99)
(C99)
Nearest integer floating point operations
(C99)(C99)(C99)
(C99)
(C99)(C99)(C99)
Floating point manipulation functions
(C99)(C99)
(C99)
(C99)
Classification
(C99)
(C99)
signbit
(C99)
Macro constants
 
Defined in header <math.h>
#define signbit(arg) /* implementation defined */
(since C99)

Determines if the given floating point number arg is negative. The macro returns an integral value.

Contents

Parameters

arg - floating point value

Return value

Nonzero integral value if arg is negative, 0 otherwise

Example

#include <stdio.h>
#include <math.h>
#include <float.h>
 
int main(void)
{
    printf("signbit(+0.0) = %d\n", signbit(+0.0));
    printf("signbit(-0.0) = %d\n", signbit(-0.0));
 
    return 0;
}

Possible output:

signbit(+0.0) = 0
signbit(-0.0) = 128

See also

(C99)(C99)
computes absolute value of a floating-point value (|x|)
(function) [edit]
produces a value with the magnitude of a given value and the sign of another given value
(function) [edit]
C++ documentation for signbit