#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>
 
/**
 * @brief For each process in the default communicator MPI_COMM_WORLD, show their rank.
 **/
int main(int argc, char* argv[])
{
    MPI_Init(&argc, &argv);
 
    int my_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
 
    printf("I am MPI process %d.\n", my_rank);
 
    MPI_Finalize();
 
    return EXIT_SUCCESS;
}