copysign(3) - NetBSD Manual Pages

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COPYSIGN(3)             NetBSD 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 func- tions may regard the sign of zero as positive. NetBSD 9.2 September 28, 2017 NetBSD 9.2
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