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

int main(int argc, char *argv[]) 
{ 
    MPI_Status status; 
    int id, np, err; 
    int a, i; 

    err = MPI_Init(&argc, &argv); 

    MPI_Comm_size(MPI_COMM_WORLD, &np); 
    MPI_Comm_rank(MPI_COMM_WORLD, &id); 

    if(id == 0) 
    { 
        a = 333; 
        for(i = 1; i < np; i++)MPI_Send(&a, 1, MPI_INT, i, 20, MPI_COMM_WORLD); 
    } 
    else MPI_Recv(&a, 1, MPI_INT, 0, 20, MPI_COMM_WORLD, &status); 

    printf("my id is %d, and a = %d\n", id, a); 

    MPI_Finalize(); 
}