#include <mpi.h>
#include <stdio.h>
 
int main(int argc, char **argv) {
 
  int my_rank; 
  int size;
  MPI_Init(&argc, &argv); /*START MPI */
 
  /*DETERMINE RANK OF THIS PROCESSOR*/
  MPI_Comm_rank(MPI_COMM_WORLD, &my_rank); 
 
  /*DETERMINE TOTAL NUMBER OF PROCESSORS*/
  MPI_Comm_size(MPI_COMM_WORLD, &size);
 
  printf("Hello world! I'm rank (processor number) %d of size %d\n", my_rank, size);
 
  MPI_Finalize();  /* EXIT MPI */
 
  return 0;
}
 
 

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