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NetBSD 6.1.5 - man page for copysignl (netbsd section 3)

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COPYSIGN(3)			   BSD Library Functions Manual 		      COPYSIGN(3)

NAME
     copysign, copysignf, copysignl -- functions to manipulate signs

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     copysign(double x, double y);

     float
     copysignf(float x, float y);

     long double
     copysignl(long double x, long double y);

DESCRIPTION
     The copysign(), copysignf(), and copysignl() functions return a value whose absolute value
     matches x, but whose sign bit is taken from y.

RETURN VALUES
     Upon successful completion, all three functions return a value with the magnitude of x and
     the sign of y.  If x is NaN , the functions return a NaN with the sign of y.

SEE ALSO
     math(3), signbit(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

CAVEATS
     Note that on implementations that represent a signed zero but do not treat negative zero
     consistently in arithmetic operations, these functions may regard the sign of zero as posi-
     tive.

BSD					  April 13, 2011				      BSD
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