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Re: [PROGRAMMERING] C og regex



Hej

Christian Nielsen wrote:
Tak. Jeg kender resultatet af mime beregninger, så derfor ved jeg at Perl
regner forkert. Den samme kode oversat til C regner rigtigt.

Bortset fra en aeldre version af Pentium, regner de fleste computere [og deres prog. sprog] rigtig. En computer regner ikke forkert, men der findes mange eksempler paa forkert brug af en computer. At en computer regner rigtig, er ikke ensbetydende med, at den som default regner med uendelig hoej praecision. Altsaa, hvis der regnes galt i dit program, er det dig og [normalt] ikke f.eks. det sprog der bruges, der goer noget galt.

Hvis du arbejder med flydende tal, vil der altid vaere et praecisionstab,
men ved rigtig brug af flydende tal, kan MAN ALTID goere tabet
ubetydelig. Korrekt brug af flydende tal er en selvstaendig videnskabelig
disciplin som nogen [vistnok] kalder nummerisk analyse eller lign. og
kraever. Korrekt brug af flydende tal til andet end trivialiteter kraever
normalt en uddannelse eller en intuitiv matematisk begavelse eller begge
dele.

--PMM



 
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