//randoms.c  - Here's a convenient way to seed random numbers in MPI.
//This uses getpid() - gets the process number of the particular process,
// and uses this as a seed to srand().
//You'll need to include sys/types.h

#include <stdio.h>
#include <sys/types.h>
#include "mpi.h"

int main(int argc, char **argv)
{
    int rank, size;
    int x;

    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank); // Who am I?
      MPI_Comm_size(MPI_COMM_WORLD, &size); // how many in all?
    srand(getpid());  //This has to go after the MPI_Init(), not before
    x = rand() % 1000;
    printf("Hello world. I am %d of %d, my random number is %d, process=%d\n",
                       rank, size, x, getpid());
    MPI_Finalize();
    return 0;
}