#include <math.h>
#include "mpi.h"
#include <iostream>
using namespace std;

int main(int argc, char *argv[]) {
    int n, rank, size, i;
    double a[10];


    MPI::Init(argc, argv);
    size = MPI::COMM_WORLD.Get_size();
    rank = MPI::COMM_WORLD.Get_rank();

    MPI::Status status;
    MPI::Request zahtjev;


    if (rank == 0)
    {
        for (i=0; i<10; i++)
        {
            a[i]=sqrt(i);
        }

        MPI::COMM_WORLD.Send(a, 10, MPI::DOUBLE, 1, 17);
        MPI::COMM_WORLD.Recv(a,10, MPI::DOUBLE, 2, 17,status);

        cout << rank << ":poruka " << status.Get_tag()<< endl;
        cout << rank << ":je stigla od ranga " << status.Get_source()  << endl;
    }
    else if(rank == 1)
    {
        MPI::COMM_WORLD.Recv(a,10, MPI::DOUBLE, 0, 17, status);
        MPI::COMM_WORLD.Send(a, 10, MPI::DOUBLE, 2, 17);

        cout << rank << ":poruka " << status.Get_tag()<< endl;
        cout << rank << ":je stigla od ranga " << status.Get_source()  << endl;
    }
    else
    {

        MPI::COMM_WORLD.Send(a, 10, MPI::DOUBLE, 0, 17);
        MPI::COMM_WORLD.Recv(a, 10, MPI::DOUBLE, 1, 17, status);

        cout << rank << ":poruka " << status.Get_tag()<< endl;
        cout << rank << ":je stigla od ranga " << status.Get_source()  << endl;
    }

    MPI::Finalize();
    return 0;
}