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OpenDarwin 7.2.1 - man page for copysign (opendarwin section 3)

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

NAME
     copysign -- changes the sign of x to that of y

SYNOPSIS
     #include <math.h>

     double
     copysign(double x, double y);

     float
     copysignf(float x, float y);

DESCRIPTION
     The copysign() and copysignf() functions return x with its sign changed to y's.

SPECIAL VALUES
     copysign(x, y) returns a NaN (with y's sign) if x is a NaN.

STANDARDS
     The copysign() and copysignf() functions conform to ISO/IEC 9899:1999(E).

BSD					   July 2, 2003 				      BSD
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