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copysign, copysignf, copysignl

Defined in header <math.h> 
float       copysignf( float x, float y );
-		 (1) (since C99) 
double      copysign( double x, double y );
-		 (2) (since C99) 
long double copysignl( long double x, long double y );
-		 (3) (since C99)
Defined in header <tgmath.h> 
#define copysign(x, y)
-		 (4) (since C99)
-1-3) Composes a floating point value with the magnitude of x and the sign of y.
-4) Type-generic macro: If any argument has type long double, copysignl is called. Otherwise, if any argument has integer type or has type double, copysign is called. Otherwise, copysignf is called.

Parameters

- -
x, y - floating point values

Return value

If no errors occur, the floating point value with the magnitude of x and the sign of y is returned.

-

If x is NaN, then NaN with the sign of y is returned.

-

If y is -0, the result is only negative if the implementation supports the signed zero consistently in arithmetic operations.

-

Error handling

This function is not subject to any errors specified in math_errhandling.

-

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

-

Notes

copysign is the only portable way to manipulate the sign of a NaN value (to examine the sign of a NaN, signbit may also be used).

-

Example

#include <stdio.h>
-#include <math.h>
- 
-int main(void)
-{
-    printf("copysign(1.0,+2.0)      = %+.1f\n", copysign(1.0,+2.0));
-    printf("copysign(1.0,-2.0)      = %+.1f\n", copysign(1.0,-2.0));
-    printf("copysign(INFINITY,-2.0) = %f\n",    copysign(INFINITY,-2.0));
-    printf("copysign(NAN,-2.0)      = %f\n",    copysign(NAN,-2.0));
-}

Possible output:

-
copysign(1.0,+2.0)      = +1.0
-copysign(1.0,-2.0)      = -1.0
-copysign(INFINITY,-2.0) = -inf
-copysign(NAN,-2.0)      = -nan

References

See also

- - -
-
(C99)(C99)
 computes absolute value of a floating-point value (\(\small{|x|}\)|x|)
(function)
-
(C99)
 checks if the given number is negative
(function macro)
C++ documentation for copysign
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/copysign -

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