Random number generator (device): Difference between revisions
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If your system has a means to generate random numbers involving not only a software algorithm (like the [[wp:/dev/random|/dev/random]] devices in Unix), show how to obtain a random 32-bit number from that mechanism. |
If your system has a means to generate random numbers involving not only a software algorithm (like the [[wp:/dev/random|/dev/random]] devices in Unix), show how to obtain a random 32-bit number from that mechanism. |
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=={{header|Ada}}== |
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random.adb: |
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<lang Ada>with Ada.Streams.Stream_IO; |
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with Ada.Text_IO; |
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procedure Random is |
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Number : Integer; |
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Random_File : Ada.Streams.Stream_IO.File_Type; |
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begin |
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Ada.Streams.Stream_IO.Open (File => Random_File, |
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Mode => Ada.Streams.Stream_IO.In_File, |
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Name => "/dev/random"); |
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Integer'Read (Ada.Streams.Stream_IO.Stream (Random_File), Number); |
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Ada.Streams.Stream_IO.Close (Random_File); |
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Ada.Text_IO.Put_Line ("Number:" & Integer'Image (Number)); |
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end Random;</lang> |
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=={{header|Forth}}== |
=={{header|Forth}}== |
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Revision as of 10:53, 15 April 2011
You are encouraged to solve this task according to the task description, using any language you may know.
If your system has a means to generate random numbers involving not only a software algorithm (like the /dev/random devices in Unix), show how to obtain a random 32-bit number from that mechanism.
Ada
random.adb: <lang Ada>with Ada.Streams.Stream_IO; with Ada.Text_IO; procedure Random is
Number : Integer; Random_File : Ada.Streams.Stream_IO.File_Type;
begin
Ada.Streams.Stream_IO.Open (File => Random_File,
Mode => Ada.Streams.Stream_IO.In_File,
Name => "/dev/random");
Integer'Read (Ada.Streams.Stream_IO.Stream (Random_File), Number);
Ada.Streams.Stream_IO.Close (Random_File);
Ada.Text_IO.Put_Line ("Number:" & Integer'Image (Number));
end Random;</lang>
Forth
<lang forth>variable rnd
- randoms ( n -- )
s" /dev/random" r/o open-file throw swap 0 do dup rnd 1 cells rot read-file throw drop rnd @ . loop close-file throw ;</lang>
J
Untested: <lang j>256#.a.i.1!:11'/dev/urandom';0 4</lang>
Fallback: <lang j>256#.a.i.4{.host'dd if=/dev/urandom bs=4 count=1'</lang>
Note: this assumes that J is running on linux.
PicoLisp
<lang PicoLisp>: (in "/dev/urandom" (rd 4)) -> 2917110327</lang>
PureBasic
PureBasic has the source for the random data is the "/dev/urandom" device on Linux or Mac OSX and the "Microsoft Cryptography API" on Windows. <lang PureBasic>If OpenCryptRandom()
MyRandom = CryptRandom(#MAXLONG) CloseCryptRandom()
EndIf</lang>
Python
<lang Python>import random rand = random.SystemRandom() rand.randint(1,10)</lang>
Ruby
<lang Ruby> require 'securerandom' SecureRandom.random_number(1 << 31) </lang>
Tcl
<lang tcl>package require Tcl 8.5
- Allow override of device name
proc systemRandomInteger Template:Device "/dev/random" {
set f [open $device "rb"] binary scan [read $f 4] "I" x close $f return $x
}</lang> Usage: <lang tcl>% puts [systemRandomInteger] 636131349</lang>