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IEEE(3)			    BSD Programmer's Manual		       IEEE(3)

NAME
     copysign, copysignf, finite, finitef, ilogb, ilogbf, nextafter,
     nextafterf, remainder, remainderf, scalbn, scalbnf - Functions for IEEE
     754 arithmetic

SYNOPSIS
     #include <math.h>

     double
     copysign(double x, double y);

     float
     copysignf(float x, float y);

     int
     finite(double x);

     int
     finitef(float x);

     int
     ilogb(double x);

     int
     ilogbf(float x);

     double
     nextafter(double x, double y);

     float
     nextafterf(float x, float y);

     double
     remainder(double x, double y);

     float
     remainderf(float x, float y);

     double
     scalbn(double x, int n);

     float
     scalbnf(float x, int n);

DESCRIPTION
     These functions are required or recommended by IEEE 754.

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

     finite() and finitef() return the value 1 just when -infinity < x < +in-
     finity; otherwise a zero is returned (when |x| = infinity or x is NaN).

     ilogb() and ilogbf() return x's exponent n, in integer format.
     ilogb(+-infinity) returns INT_MAX and ilogb(0) returns INT_MIN.

     nextafter() and nextafterf() return the next machine representable number
     from x in direction y.

     remainder() and remainderf() return the remainder r := x - n*y where n is
     the integer nearest the exact value of x/y; moreover if |n - x/y| = 1/2
     then n is even.  Consequently the remainder is computed exactly and |r|
     <= |y|/2. But remainder(x, 0) and remainder(infinity, 0) are invalid op-
     erations that produce a NaN.

     scalbn() and scalbnf() return x*(2**n) computed by exponent manipulation.

ERRORS
     For remainder() and remainderf(), if y = 0 then:

     _IEEE_    The return value is NaN.
     _POSIX_   Same as _IEEE_, but errno is also set to EDOM.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.
	       The exception type is DOMAIN.
     _SVID_    Same as _XOPEN_, and a message is printed to stderr if errno is
	       set.

SEE ALSO
     math(3)

HISTORY
     The ieee functions appeared in 4.3BSD.

BSDI BSD/OS			 March 4, 1998				     2
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