MPI_LAB_1_scanf

// Author: Wes Kendall
// Copyright 2011 www.mpitutorial.com
// This code is provided freely with the tutorials on mpitutorial.com. Feel
// free to modify it for your own use. Any distribution of the code must
// either provide a link to www.mpitutorial.com or keep this header intact.
//
// MPI_Send, MPI_Recv example. Communicates the number -1 from process 0
// to process 1.
//
#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>

#define length 100

int main(int argc, char** argv) {
  // Initialize the MPI environment
  MPI_Init(NULL, NULL);
  // Find out rank, size
  int world_rank;
  MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
  int world_size;
  MPI_Comm_size(MPI_COMM_WORLD, &world_size);

  // We are assuming at least 2 processes for this task
  if (world_size < 2) {
    fprintf(stderr, "World size must be greater than 1 for %s\n", argv[0]);
    MPI_Abort(MPI_COMM_WORLD, 1);
  }

  if (world_rank == 0) {
    printf("give message");
    char data0[length];
    scanf("%s", data0);
    MPI_Send(
      /* data         = */ data0,
      /* count        = */ length,
      /* datatype     = */ MPI_CHAR,
      /* destination  = */ 1,
      /* tag          = */ 0,
      /* communicator = */ MPI_COMM_WORLD);

  } else if( world_rank==1 ) {
    char data[length];

        MPI_Recv(
      /* data         = */ data,
      /* count        = */ length,
      /* datatype     = */ MPI_CHAR,
      /* source       = */ MPI_ANY_SOURCE,
      /* tag          = */ MPI_ANY_TAG,
      /* communicator = */ MPI_COMM_WORLD,
      /* status       = */ MPI_STATUS_IGNORE);

        printf("message: %s", data);

  }
  MPI_Finalize();
}