BAXTER_A@wehi.dn.mu.oz (08/07/90)
I am currently porting (I hope) HPGLtoPS and was wondering: What does the UNIX C function rint() do? Email would be nice, Regards Alan
spoffojj@hq.af.mil (Jason Spofford) (08/07/90)
In <10936@wehi.dn.mu.oz> BAXTER_A@wehi.dn.mu.oz writes: >I am currently porting (I hope) HPGLtoPS and was wondering: >What does the UNIX C function rint() do? Here is the man page on rint() - I couldn't mail directly so everyone else may want to skip the rest of this mail note. RINT(3M) MATHEMATICAL LIBRARY RINT(3M) NAME aint, anint, ceil, floor, rint, irint, nint - round to integral value in floating-point or integer format SYNOPSIS #include <math.h> double aint(x) double x; double anint(x) double x; double ceil(x) double x; double floor(x) double x; double rint(x) double x; int irint(x) double x; int nint(x) double x; DESCRIPTION aint, anint, ceil, floor, and rint() convert a double value into an integral value in double format. They vary in how they choose the result when the argument is not already an integral value. Here an integral value means a value of a mathematical integer, which however might be too large to fit in a particular computer's int format. All sufficiently large values in a particular floating-point format are already integral; in IEEE double-precision format, that means all values >= 2**52. Zeros, infinities, and quiet NaNs are treated as integral values by these functions, which always preserve their argument's sign. aint() returns the integral value between _x and 0, nearest _x. This corresponds to IEEE rounding toward zero and to the Fortran generic intrinsic function aint. anint() returns the nearest integral value to _x, except halfway cases are rounded to the integral value larger in magnitude. This corresponds to the Fortran generic intrin- sic function anint. ceil() returns the least integral value greater than or equal to _x. This corresponds to IEEE rounding toward Sun Release 4.0 Last change: 15 October 1987 1 RINT(3M) MATHEMATICAL LIBRARY RINT(3M) positive infinity. floor() returns the greatest integral value less than or equal to _x. This corresponds to IEEE rounding toward nega- tive infinity. rint() rounds _x to an integral value according to the current IEEE rounding direction. irint converts _x into int format according to the current IEEE rounding direction. nint() converts _x into int format rounding to the nearest int value, except halfway cases are rounded to the int value larger in magnitude. This corresponds to the Fortran gen- eric intrinsic function nint. Sun Release 4.0 Last change: 15 October 1987 2 -- ---------------------------------------------------------- ) Jason Spofford The LAN Manager ( ) spoffojj.hq.af.mil George Mason Univ. Grad. Stud. ( ----------------------------------------------------------
aduncan@rhea.trl.oz.au (Allan Duncan) (08/09/90)
From article <10936@wehi.dn.mu.oz>, by BAXTER_A@wehi.dn.mu.oz: > I am currently porting (I hope) HPGLtoPS and was wondering: > > What does the UNIX C function rint() do? > > Email would be nice, > Regards Alan Allan Duncan ACSnet a.duncan@trl.oz (03) 541 6708 ARPA a.duncan%trl.oz.au@uunet.uu.net UUCP {uunet,hplabs,ukc}!munnari!trl.oz.au!a.duncan Telecom Research Labs, PO Box 249, Clayton, Victoria, 3168, Australia.
aduncan@rhea.trl.oz.au (Allan Duncan) (08/09/90)
From article <10936@wehi.dn.mu.oz>, by BAXTER_A@wehi.dn.mu.oz: > I am currently porting (I hope) HPGLtoPS and was wondering: > > What does the UNIX C function rint() do? [Sorry about the previous dud followup.] It stands for round integer - double rint(x) double x returns the integer represented as a double nearest to x in the prevailing mode. It doesn't appear in V7 Unix, but it is in Ultrix, find it under the entry for floor(). Allan Duncan ACSnet a.duncan@trl.oz (03) 541 6708 ARPA a.duncan%trl.oz.au@uunet.uu.net UUCP {uunet,hplabs,ukc}!munnari!trl.oz.au!a.duncan Telecom Research Labs, PO Box 249, Clayton, Victoria, 3168, Australia.
david@twg.com (David S. Herron) (08/11/90)
In article <10936@wehi.dn.mu.oz> BAXTER_A@wehi.dn.mu.oz writes: >I am currently porting (I hope) HPGLtoPS and was wondering: > >What does the UNIX C function rint() do? > >Email would be nice, >Regards Alan Will a Unix beige do instead?? er.. Anyway, I'd never heard of this routine before so I looked it up. It's a new one to the man page I found it on, so it must be pretty recent. Quoting from the SunOS man page: ... double rint(x) double x; ... rint() rounds {\it {\bf x}} to an integral value according to the current IEEE rounding direction. There is an ieee_flags() routine which lets you set various IEEE floating point options. For instance, ieee_flags("set", "direction", "tozero", &out); will set the rounding direction towards zero. Weeeeiiirrrdd.. (useful though..) -- <- David Herron, an MMDF weenie, <david@twg.com> <- Formerly: David Herron -- NonResident E-Mail Hack <david@ms.uky.edu> <- <- Sign me up for one "I survived Jaka's Story" T-shirt!