exchange.cpp

#include "mpi.h"

int main(int argc, char **argv) {
	MPI_Init(&argc, &argv);

	int rank, size;
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	MPI_Comm_size(MPI_COMM_WORLD, &size);

	int data = 15, max = 10;
	if (rank == 0) {
		int COUNT = 1, TARGET = 1, TAG = 0;
		MPI_Send(&data, COUNT, MPI_INT, TARGET, TAG, MPI_COMM_WORLD);
		printf("data[%d] sent to %d.\n", data, TARGET);
	} else {
		int COUNT = 1, SOURCE = 0, TAG = 0;
		MPI_Recv(&data, COUNT, MPI_INT, SOURCE, TAG, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
		printf("data[%d] received from %d.\n", data, SOURCE);
	}

	MPI_Finalize();
	return 0;
}