ex4.c
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	#include <stdio.h>
	#include <mpi.h>

	// A minimal MPI program
	// ---------------------

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

	// Each task owns its private set of the following variables
	// ---------------------------------------------------------

	int my_rank, tasks_number;
	char machine_name [512];
	int name_length;


	// We should start with...
	// -----------------------

	MPI_Init (& argc, & argv);


	// Getting information about the MPI environnement
	// -----------------------------------------------

	MPI_Comm_size (MPI_COMM_WORLD, & tasks_number);
	MPI_Comm_rank (MPI_COMM_WORLD, & my_rank);
	MPI_Get_processor_name (machine_name, & name_length);


	printf (
	"Hello, my rank is %d among %d tasks on machine %s\n",
	my_rank, tasks_number, machine_name
	);
	fflush (stdout);


	// Let's wait until all the tasks have reached this point
	// ------------------------------------------------------

	MPI_Barrier (MPI_COMM_WORLD);

	if ( my_rank == 0 ) {
	printf ("--- BARRIER! ---\n");
	fflush (stdout);
	}


	// ...and we should terminate by...
	// --------------------------------

	MPI_Finalize ();

	return 0;
	}