Re: Szybkość Javy wg Horstmanna a testy...

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Article #141792

#141792

From: jarekr
Date: Mon, 20 Oct 2008 14:06

32 lines
2126 bytes

On 20 Paź, 15:59, Abece <a...@abece.nospam.in.w.pl> wrote:
> A kluczowa klamra, której zabrakło to gdzie niby jej brak?

w javie masz taki kawałek:
    if(b.get(i))
    count++;
    int k=2*i;
    while(k<=n)
    {
            b.clear(k);
            k = k + 1;
    }
   i++;

a w C++ taki:
          if (b.test(i))
         {
             count++;
             int k=2*i;
             while (k<=n)
             {
                 b.reset(k);
                 k =  k+ 1;
             }
         }
         i++;

To jest bardzo duża różnica :-).
Gdybys wyświetlał wyniki  w C++  (count) - to byś widział, że jest
skrajnie inny (i poprawny).
Zresztą ten kawałek to dobry przykład dlaczego po IF-ie ZAWSZE warto
mieć klamry. (czy w C++ czy w javie).

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From: jarekr <jratajski@gmail.com>
Newsgroups: pl.comp.lang.java
Subject: Re: Szybkość Javy wg Horstmanna a testy...
Date: Mon, 20 Oct 2008 07:06:55 -0700 (PDT)
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