#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char** argv) {
	MPI_Init(NULL, NULL);
	int world_rank;
	MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
	int world_size;
	MPI_Comm_size(MPI_COMM_WORLD, &world_size);
	if(world_size < 2) {
		fprintf(stderr, "World size must be greater than 1 for %s\n", argv[0]);
		MPI_Abort(MPI_COMM_WORLD, 1);
	}
	int number;
	if(world_rank == 0) {
		number = -1;
		MPI_Send(&number, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
	} else if (world_rank == 1) {
		MPI_Recv(&number, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
		printf("Proess 1 received number %d from process 0\n", number);
	}
	MPI_Finalize();
}