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For hobbyists, professionals, and the curious
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| Random number batch file |
chrisbrownie
23/10/05 12:06:15 AM
Apprentice
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hey guys,
im having trouble making a batch file that generates random numbers, i dont care how many at once, i just want one that does it. i dont need anytinh cool or flashy just a randomnumber.bat
cheers -----
From the Sunshine Coast? PM Me!
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AIMBOT
24/10/05 8:42:58 PM
Champion
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http://www.robvanderwoude.com/batexamples_pr.html -----
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The Broken Hammer, Defending our lovely "Search Feature"
http://www.atomicmpc.com.au/forums.asp?s=1&c=4&t=2439
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pappes
29/10/05 10:52:49 AM
Overlord
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Aimbot that is a cool site.
however it does not mention that in win xp has a propper random number generater accessable to batch files. you can use
set myvar=%random%
to set the environment variabel myvar to random decimal number between 0 and 32767
you could the use somthing like
set /a (myvar*101/32768)+1
to get a number between 1 and 100
Edited by pappes: 29/10/2005 10:54:09 AM -----
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setagllib
29/10/05 11:27:24 AM
Banned
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pappes: back to primary school for you. If it can be from 0..32767, and you multiply by 101 /32768 then add 1, it could be as high as 102.
To do this PROPERLY, break it down into variables:
min = 1
max = 100
range = max-min = 99
minrand = 0
maxrand = 32767
rangerand = maxrand - minrand = 32767
number = (%random% - minrand) * range / rangerand + min
= %random% * 99 / 32767 + 1
And that will work properly.
But you call that a proper RNG? It's 7 bit PRNG for crying out loud. There is no reason at all not to have a full 32 bits of entropy, but Microsoft seems to think that 7 bits is "random enough for most people" or something. Go read up some information/data theory and cryptography to see why 7 bits is garbage.
Edited by setagllib: 29/10/2005 11:54:19 AM -----
profile.c:42: error: `tagline' undeclared
(first use in this function)
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AIMBOT
30/10/05 3:15:20 PM
Champion
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A very simple way (Probably won't suite your needs) is:
To set a random number to your variable:
set myvar=%random%
And to view the number of your variable:
set myvar -----
Bom-Bom, Rock the Nation!
The Broken Hammer, Defending our lovely "Search Feature"
http://www.atomicmpc.com.au/forums.asp?s=1&c=4&t=2439
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setagllib
30/10/05 3:29:59 PM
Banned
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AIMBOT, we just went over that. Read the thread before posting. -----
profile.c:42: error: `tagline' undeclared
(first use in this function)
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AIMBOT
31/10/05 3:05:32 PM
Champion
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Looks ^
Lol, that’ll learn me. -----
Bom-Bom, Rock the Nation!
The Broken Hammer, Defending our lovely "Search Feature"
http://www.atomicmpc.com.au/forums.asp?s=1&c=4&t=2439
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chrisbrownie
2/11/05 8:48:27 PM
Disciple
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lol thx ill keep having a fiddle -----
From the Sunshine Coast? PM Me!
Sempron 2500+ @ 2.104Ghz, ASUS A7N8X-X, 768MB DDR400, 80GB Seagate 7200rpm, Tsunami 500W PSU, MSI NX6600GT ViVo, Raidmax Cobra, LG GSA-4120B+, Logitech MX-510
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