import Foundation

func randomGaussian() -> Double {
    var u1 = 0.0
    var u2 = 0.0

    // Avoid log(0)
    repeat {
        u1 = Double.random(in: 0.0 ..< 1.0)
    } while u1 == 0.0

    u2 = Double.random(in: 0.0 ..< 1.0)

    return sqrt(-2.0 * log(u1)) * cos(2.0 * Double.pi * u2)
}

print("Uniform integers in [1, 6]")
for _ in 0..<10 {
    print(Int.random(in: 1...6))
}

print("Uniform doubles in [0.0, 1.0)")
for _ in 0..<10 {
    print(Double.random(in: 0.0 ..< 1.0))
}

print("Standard Normal")
for _ in 0..<10 {
    print(randomGaussian())
}