hello mpi

hello_mpi.c

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

int main(int argc, char *argv[]){
        int nprocs, rank;

        MPI_Init(&argc, &argv);
        MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
        MPI_Comm_rank(MPI_COMM_WORLD, &rank);

        printf("Process %d of %d\n", rank, nprocs);

        MPI_Finalize();
        return 0;
}