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COPYSIGN(3)                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);

     #include <tgmath.h>

     real-floating
     copysign(real-floating x, real-floating 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 positive.

NetBSD 10.99                  September 28, 2017                  NetBSD 10.99