#include <iostream>  // std::cout
#include <random>    // random number generator

/*
 * Attention: Never do it like this!
 * 
 * This code contains a serious bug in memory handling, a memory leak.
 * There are different possible ways to fix that, which we can discuss.
 */ 

namespace
{
   int iterations = 1000;
   int output_frequency = 100;
   constexpr int array_size = 1'000'000;
   std::subtract_with_carry_engine<unsigned,24,10,24> generator(0);
}

// use the random number from the standard library
unsigned* create_random_array()
{
   unsigned* data = new unsigned[array_size];
   for(int i = 0; i < array_size; i++) data[i] = generator();
   return data;
}

// compute average of an array with random numbers
double crunch_numbers(unsigned* data)
{
   long long sum = 0;
   for(int i = 0; i < array_size; i++) sum += data[i];
   return (double)sum / array_size;
}

int main()
{
   for(int k = 0; k < iterations; k++)
   {
      double avg = crunch_numbers(create_random_array());
      if((k+1) % output_frequency == 0)
         std::cout << k+1 << "\t" << avg << "\n";
   }
}