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Pseudo-random numbers/Xorshift star: Difference between revisions
Pseudo-random numbers/Xorshift star (view source)
Revision as of 15:29, 12 October 2021
, 2 years agoAdd Swift
m (→{{header|Phix}}: added syntax colouring the hard way) |
(Add Swift) |
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Line 1,310:
4: 20007
</pre>
=={{header|Swift}}==
<lang swift>import Foundation
struct XorshiftStar {
private let magic: UInt64 = 0x2545F4914F6CDD1D
private var state: UInt64
init(seed: UInt64) {
state = seed
}
mutating func nextInt() -> UInt64 {
state ^= state &>> 12
state ^= state &<< 25
state ^= state &>> 27
return (state &* magic) &>> 32
}
mutating func nextFloat() -> Float {
return Float(nextInt()) / Float(1 << 32)
}
}
extension XorshiftStar: RandomNumberGenerator, IteratorProtocol, Sequence {
mutating func next() -> UInt64 {
return nextInt()
}
mutating func next() -> UInt64? {
return nextInt()
}
}
for (i, n) in XorshiftStar(seed: 1234567).lazy.enumerated().prefix(5) {
print("\(i): \(n)")
}
var gen = XorshiftStar(seed: 987654321)
var counts = [Float: Int]()
for _ in 0..<100_000 {
counts[floorf(gen.nextFloat() * 5), default: 0] += 1
}
print(counts)</lang>
{{out}}
<pre>0: 3540625527
1: 2750739987
2: 4037983143
3: 1993361440
4: 3809424708
[1.0: 19922, 4.0: 20007, 3.0: 20031, 2.0: 19937, 0.0: 20103]</pre>
=={{header|Wren}}==
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