package fr.umlv.conc;

public class RandomNumberGenerator {
  private long x;
  
  public RandomNumberGenerator(long seed) {
    if (seed == 0) {
      throw new IllegalArgumentException("seed == 0");
    }
    x = seed;
  }
  
  public long next() {  // Marsaglia's XorShift
    x ^= x >>> 12;
    x ^= x << 25;
    x ^= x >>> 27;
    return x * 2685821657736338717L;
  }
  
  public static void main(String[] args) {
    RandomNumberGenerator rng = new RandomNumberGenerator(1);
    for(int i = 0; i < 5_000; i++) {
      System.out.println(rng.next());
    }
  }
}