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From: | Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Random numbers |
Organization: | Pin Eight Software http://pineight.8m.com/ |
Message-ID: | <cs95jscumbafalh5jj0f8l6dm1u0uiq5o5@4ax.com> |
References: | <392CB951 DOT 34B432E6 AT chemistry DOT uq DOT edu DOT au> <Pine DOT SUN DOT 3 DOT 91 DOT 1000525084705 DOT 21360M-100000 AT is> |
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NNTP-Posting-Date: | Mon, 29 May 2000 17:30:06 GMT |
Distribution: | world |
Date: | Mon, 29 May 2000 17:30:06 GMT |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
On Thu, 25 May 2000 08:49:55 +0300 (IDT), Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote: >The recommended way to generate random numbers from a smaller range is >described in section 22.23 of the DJGPP FAQ list, which see. The FAQ entry describes the "rescaling" technique: #include <stdlib.h> int random_number = low + (double)rand () * (high - low + 1) / RAND_MAX; When I do this on my target platform (386 PC), the cast to double produces SIGNOFPE. Including emu387.dxe and emu387.bat (a script to insert the required environment variables) fixed it. @ECHO OFF SET 387=N SET EMU387=C:\PINEIGHT\EMU387.DXE Does this mean I have to bundle emu387.dxe with all programs that use random numbers? Or can I do this to get rid of the unrandom low-order bits? nextPiece = (rand() >> 4) % 5; -- Damian Yerrick "I refuse to listen to those who refuse to listen to reason." See the whole sig: http://www.rose-hulman.edu/~yerricde/sig.html This is McAfee VirusScan. Add these two lines to your signature to prevent the spread of signature viruses. http://www.mcafee.com/
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