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

	int main(int argc, char *argv[]) {
	int rank;
	int buf1[100];
	int buf2[100];
	MPI_Request request;
	MPI_Status status;
	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);

	if (rank == 0) {
	MPI_Isend(buf1, 10, MPI_INT, 1, 0, MPI_COMM_WORLD, &request);
	MPI_Recv(buf2, 10, MPI_INT, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
	}else if (rank == 1){
	MPI_Isend(buf1, 10, MPI_INT, 0, 0, MPI_COMM_WORLD, &request);
	MPI_Recv(buf2, 10, MPI_INT, 0, 0,MPI_COMM_WORLD, MPI_STATUS_IGNORE);
	}

	MPI_Wait(&request, &status);
	memcpy(buf1, buf2, 10*sizeof(int));

	MPI_Finalize();
	}