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Added random number generator and something that uses it as a test.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,91 @@ | ||
| /* | ||
| * random.d | ||
| * | ||
| * This module implements a random number generator. | ||
| * | ||
| * It is based upon the implementation by Steve Park and Dave Geyer. That is, | ||
| * it is based upon a Lehmer random number generator. It returns a random | ||
| * number distributed uniformly between 0.0 and 1.0. | ||
| * | ||
| * Author: Dave Wilkinson | ||
| * Reference: Steve Park, Dave Geyer | ||
| * Originated: May 18, 2009 | ||
| * | ||
| */ | ||
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| module core.random; | ||
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| import platform.imports; | ||
| mixin(PlatformGenericImport!("definitions")); | ||
| mixin(PlatformScaffoldImport!()); | ||
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| // Description: This class represents a Random number generator. | ||
| class Random { | ||
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| // Description: This will set up a new random number generator and will seed it with the given seed. | ||
| // seed: The seed to use with the generator. | ||
| this(long seed = -1) { | ||
| setSeed(seed); | ||
| } | ||
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| // Description: This will reseed the random number generator. | ||
| // seed: The seem to use with the generator. | ||
| void setSeed(long seed) { | ||
| if (seed < 0) { | ||
| seed = Scaffold.TimeGet(); | ||
| } | ||
| state = seed; | ||
| } | ||
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| // Description: This will retrieve the current state of the generator. | ||
| // Returns: The state of the generator. (Reseed with this value to continue from the same position) | ||
| long getSeed() { | ||
| return state; | ||
| } | ||
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| double nextDouble() { | ||
| mutateState(); | ||
| return cast(double)state / cast(double)MODULUS; | ||
| } | ||
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| long next() { | ||
| mutateState(); | ||
| return state; | ||
| } | ||
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| long next(long max) { | ||
| if (max < 0) { return 0; } | ||
| return next() % max; | ||
| } | ||
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| long next(long min, long max) { | ||
| if (max < 0) { return 0; } | ||
| if (min < 0) { return 0; } | ||
| if (min > max) { max = min; } | ||
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| return (next() % (max - min)) + min; | ||
| } | ||
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| protected: | ||
| const auto MODULUS = 2147483647; | ||
| const auto MULTIPLIER = 48271; | ||
| const auto CHECK = 399268537; | ||
| const auto A256 = 22925; | ||
| const auto DEFAULT = 123456789; | ||
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| long state = DEFAULT; | ||
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| void mutateState() { | ||
| const long Q = MODULUS / MULTIPLIER; | ||
| const long R = MODULUS % MULTIPLIER; | ||
| long t; | ||
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| t = MULTIPLIER * (state % Q) - R * (state / Q); | ||
| if (t > 0) { | ||
| state = t; | ||
| } | ||
| else { | ||
| state = t + MODULUS; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,6 @@ | ||
| print "Hello from Lua" | ||
| print "Hello from Lua" | ||
| print "Start" | ||
| for i=1,10 do | ||
| print(i) | ||
| end | ||
| print "End" |
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