#include <stdio.h>
#include <time.h>
#include <string.h>
#include "mpi.h"

int main (int argc, char* argv[])
{ /* main */
    const int  maximum_message_length = 100;
    const int  master_rank            =   0;
    char       message[maximum_message_length+1];
    MPI_Status status;      /* Info about receive status  */
    int        my_rank;     /* This process ID            */
    int        num_procs;   /* Number of processes in run */
    int        source;      /* Process ID to receive from */
    int        destination; /* Process ID to send to      */
    int        tag = 0;     /* Message ID                 */
    int        mpi_error;   /* Error code for MPI calls   */
    int        icount   ;
    char  processor_name[MPI_MAX_PROCESSOR_NAME];
    int  name_length;
    mpi_error =MPI_Init(&argc, &argv);//will not deal with mpi_error except last one.
    mpi_error =MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
    mpi_error =MPI_Comm_size(MPI_COMM_WORLD, &num_procs);
    if (my_rank != master_rank) {
        mpi_error=MPI_Get_processor_name(processor_name,&name_length); 
        sprintf(message, "Greetings from process #%d running on %s\n", my_rank, processor_name);
        destination = master_rank;
        mpi_error =MPI_Send(message, strlen(message) + 1, MPI_CHAR,destination, tag, MPI_COMM_WORLD);
    } /* if (my_rank != master_rank) */
    else {
        for (source = 0; source < num_procs; source++) {
            if (source != master_rank) {
                mpi_error =
                MPI_Recv(message, maximum_message_length + 1, MPI_CHAR, source, tag, MPI_COMM_WORLD, &status);
                printf( "%s  \n", message);
            }//if
        }//for
    } /* if (my_rank != master_rank)else */
    mpi_error = MPI_Finalize();
    if (MPI_SUCCESS!=mpi_error)
        return mpi_error;
    else
        return 0;
} /* main */

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