#include <mpi.h> 
#include <stdio.h> 
#include <stdlib.h> 

void main(int argc, char *argv[]) 
{ 
    int rank; 
    double param, sum; 
    MPI_Init(&argc, &argv); 
    MPI_Comm_rank(MPI_COMM_WORLD,&rank); 
    if(rank==2) param = 23.0; 
    MPI_Bcast(&param, 1, MPI_DOUBLE, 2, MPI_COMM_WORLD); 
    printf("my id is %d, and param = %d\n", rank, param); 
    MPI_Finalize(); 
}