COPYSIGN(3) BSD Library Functions Manual COPYSIGN(3)NAME
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.
SEE ALSO math(3), signbit(3)STANDARDS
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.
BSD April 13, 2011 BSD
Check Out this Related Man Page
COPYSIGN(3) Linux Programmer's Manual COPYSIGN(3)NAME
copysign, copysignf, copysignl - copy sign of a number
double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
copysign(), copysignf(), copysignl():
_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
The copysign() functions return a value whose absolute value matches that of x, but whose sign bit matches that of y.
For example, copysign(42.0, -1.0) and copysign(-42.0, -1.0) both return -42.0.
On success, these functions return a value whose magnitude is taken from x and whose sign is taken from y.
If x is a NaN, a NaN with the sign bit of y is returned.
No errors occur.
C99, POSIX.1-2001. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).
On architectures where the floating-point formats are not IEEE 754 compliant, the copysign() functions may treat a negative zero as posi-
SEE ALSO signbit(3)COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2012-03-25 COPYSIGN(3)
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