利用Swift语言特性，随手写个伪随机数生成器
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利用Swift语言特性，随手写个伪随机数生成器
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//
// main.swift
// Ultimate
//
// Created by Mewlan Musajan on 2/13/22.
//
// Apple Inc. “The Swift Programming Language (Swift 5.5).” Apple Books. https://books.apple.com/us/book/the-swift-programming-language-swift-5-4/id881256329protocol RandomNumberGenerator {func random() -> Double
}// Linear Congruential Generator
class LinearCongruentialGenerator: RandomNumberGenerator {var lastRandom = 42.0let m = 139968.0let a = 3877.0let c = 29573.0func random() -> Double {lastRandom = ((lastRandom * a + c).truncatingRemainder(dividingBy: m))return lastRandom / m}
}
let generator = LinearCongruentialGenerator()
print("Here's a random number: \(generator.random())")
print("And another one: \(generator.random())")extension Int {func repetitions(task: () -> Void) {for _ in 0..<self {task()}}
}5.repetitions {print(generator.random())
}var randomNumberSet: Set<Int> = []
8.repetitions {randomNumberSet.update(with: Int(generator.random() * 10))
}8.repetitions {if var someNumber = randomNumberSet.popFirst() {if someNumber == 0 {someNumber = 1}print(someNumber, terminator: "")}
}
print()
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