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copysign(3)

NAME

     copysign, copysignf, copysignl -- copy sign

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 x with its
     sign changed to y's.

SEE ALSO

     fabs(3), fdim(3), ieee(3), math(3)

STANDARDS

     The copysign(), copysignf(), and copysignl() routines conform to ISO/IEC
     9899:1999 (``ISO C99'').  They implement the Copysign function recom-
     mended by IEEE Std 754-1985.

HISTORY

     The copysign(), copysignf(), and copysignl() functions appeared in
     4.3BSD, FreeBSD 2.0, and FreeBSD 5.3, respectively.

FreeBSD 5.4		       January 26, 2005 		   FreeBSD 5.4

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