const std = @import("std");

const Normal = struct {
    mean: f64,
    standard_deviation: f64,

    pub fn sample(normal: Normal, r: *std.rand.Random) f64 {
        return normal.mean + r.floatNorm(f64) * normal.standard_deviation;
    }
};

test "Normal" {
    var r = std.rand.Xoroshiro128.init(42);
    const normal = Normal{ .mean = 0, .standard_deviation = 1 };
    const actual = normal.sample(&(r.random));
    const expected = 1.103529993107505;
    std.testing.expectEqual(actual, expected);
}