#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream.h>
#include <fstream.h>
#include <math.h>

#include <mpi.h>



int main(int argc, char **argv)
{
 
  int  ThisCore, NCore, N_core_array[4];
  int NumberTest;
  MPI_Status  status;  
  

  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &ThisCore);
  MPI_Comm_size(MPI_COMM_WORLD, &NCore);

  


  if(ThisCore == 0)
    NumberTest = 3245;
  else
    NumberTest = 0;

  MPI_Bcast(&NumberTest,  1, MPI_INT, 0, MPI_COMM_WORLD);
 
  MPI_Barrier(MPI_COMM_WORLD); //==================================================

  cout<<"ThisCore "<<ThisCore<<" test number="<<NumberTest;


  MPI_Allgather(&ThisCore, 1, MPI_INT, N_core_array, 1, MPI_INT, MPI_COMM_WORLD);
  
  if(ThisCore == 3)
    for(int i=0; i< 4; i++)
      cout<<i<<" "<<N_core_array[i]<<endl;
  
  MPI_Finalize();

}