#include<mpi.h>
#include<assert.h>

int myrank;

int main(int argc, char* argv[]) {
  double buf = 0.0;
	
  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
  if(myrank == 0) {
    buf = 1.0;
    MPI_Send(&buf, 1, MPI_DOUBLE, 1, 0, MPI_COMM_WORLD);
  } else {
    MPI_Recv(&buf, 1, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
  }
  assert(buf == 1.0);
  MPI_Finalize();
}