[Issue 3165] What kind of integer division does D use?
https://issues.dlang.org/show_bug.cgi?id=3165 Andrei Alexandrescu changed: What|Removed |Added Version|unspecified |D2 --
[Issue 3165] What kind of integer division does D use?
http://d.puremagic.com/issues/show_bug.cgi?id=3165 Walter Bright changed: What|Removed |Added Status|NEW |RESOLVED CC||bugzi...@digitalmars.com Resolution||FIXED --- Comment #3 from Walter Bright 2009-09-03 13:25:32 PDT --- Fixed dmd 1.047 and 2.032 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 3165] What kind of integer division does D use?
http://d.puremagic.com/issues/show_bug.cgi?id=3165 Stewart Gordon changed: What|Removed |Added URL|http://www.digitalmars.com/ |http://www.digitalmars.com/ |d/2.0/expression.html#MulEx |d/1.0/expression.html#MulEx |pression|pression CC||s...@iname.com Blocks||677 --- Comment #2 from Stewart Gordon 2009-07-14 16:30:04 PDT --- Changing URL since this is a D1 spec issue just the same. But you could well ask why it defines it as undefined for % but makes no comment at all (even on whether it's rounded up, down or off for +ve operands) for /. I've felt for ages that the programmer ought to have the choice between trunc and floor versions for both http://www.digitalmars.com/d/archives/digitalmars/D/13125.html but that's another matter. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 3165] What kind of integer division does D use?
http://d.puremagic.com/issues/show_bug.cgi?id=3165
--- Comment #1 from Michiel Helvensteijn 2009-07-12
14:11:52 PDT ---
I've ran the following test:
--
import std.stdio;
int main() {
writefln(8/3);
writefln(8/(-3));
writefln((-8)/3);
writefln((-8)/(-3));
writefln(8%3);
writefln(8%(-3));
writefln((-8)%3);
writefln((-8)%(-3));
return 0;
}
--
outputs the following
--
2
-2
-2
2
2
2
-2
-2
--
So DMD uses truncated division. The quotient rounds towards zero and the
remainder has the same sign as the dividend.
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