COPYSIGN(3) BSD Programmer's Manual COPYSIGN(3)
copysign, copysignf, copysignl - functions to manipulate signs
#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 copysign(), copysignf(), and copysignl() functions return a value whose absolute value matches x, but whose sign bit is taken from y.
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.
The described functions conform to ISO/IEC 9899:1999 ("ISO C99").
Note that on implementations that represent a signed zero but do not treat negative zero consistently in arithmetic operations, these func- tions may regard the sign of zero as positive. MirOS BSD #10-current April 13, 2011 1
Generated on 2013-04-27 00:20:00 by $MirOS: src/scripts/roff2htm,v 1.77 2013/01/01 20:49:09 tg Exp $
These manual pages and other documentation are copyrighted by their respective writers;
their source is available at our CVSweb,
AnonCVS, and other mirrors. The rest is Copyright © 2002‒2013 The MirOS Project, Germany.
This product includes material provided by Thorsten Glaser.
This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.