IEEE(3) BSD Programmer's Manual IEEE(3)[top]NAMEcopysign, copysignf, finite, finitef, ilogb, ilogbf, nextafter, nextafterf, remainder, remainderf, scalbn, scalbnf - Functions for IEEE 754 arithmeticSYNOPSIS#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);DESCRIPTIONThese 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< 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.-infinityERRORSFor 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 ALSOmath(3)HISTORYThe ieee functions appeared in 4.3BSD.BSDI BSD/OS March 4, 1998 2

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