#include <stdio.h>
#include "mpi.h"

main(int argc, char** argv)
{

int my_rank;
int size;
int namelen;
char proc_name[MPI_MAX_PROCESSOR_NAME];

MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Get_processor_name(proc_name, &namelen);

if (my_rank == 2)
printf("Hello – I am process 2\n"); 
else
printf("Hello from process %d of  %d on %s\n", my_rank, size, proc_name);

MPI_Finalize();
}