#include <mpi.h>
#include <iostream>

int main(int argc, char** argv) {
    // Initialize the MPI environment
    MPI_Init(&argc, &argv);

    // Get the number of processes
    int world_size;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);

    // Get the rank (ID) of the process
    int world_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

    // Get the name of the processor node
    char processor_name[MPI_MAX_PROCESSOR_NAME];
    int name_len;
    MPI_Get_processor_name(processor_name, &name_len);

    // Print off a hello world message from each process
    std::cout << "Hello world from process rank " << world_rank 
              << " out of " << world_size 
              << " processors on node " << processor_name << std::endl;

    // Finalize the MPI environment.
    MPI_Finalize();
    return 0;
}