COPYSIGN(3) Library Functions Manual COPYSIGN(3)

copysign copysignf copysignl — number manipulation function

#include <math.h>

double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.

These functions shall produce a value with the magnitude of x and the sign of y. On implementations that represent a signed zero but do not treat negative zero consistently in arithmetic operations, these functions regard the sign of zero as positive.

Upon successful completion, these functions shall return a value with the magnitude of x and the sign of y.

No errors are defined.

None.

None.

None.

None.

signbit(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <math.h>

First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.

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January 1, 2004 posix.fail