random

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <random>
#include <chrono>
using namespace std;
int main() {
  srand((unsigned) time(NULL));
  int a = (int) (rand() / ((double) RAND_MAX + 1.) * 3.);

  unsigned seed = chrono::system_clock::now().time_since_epoch().count();
  mt19937_64 generator(seed);
  uniform_int_distribution<int> distribution(0, 2);
  int b = distribution(generator);

  cout << "cstdlib: " << a << endl;
  cout << "random (c++11): " << b << endl;
}