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COPYSIGN(3) BSD Library Functions Manual COPYSIGN(3)
copysign, copysignf, copysignl -- functions to manipulate signs
Math Library (libm, -lm)
copysign(double x, double y);
copysignf(float x, float y);
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 functions may regard the sign of zero as posi-
BSD April 13, 2011 BSD
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