#include <mpi.h>
#include <stdio.h>
 
int main(int argc, char** argv) {
        int rank;
        int buf;
        const int root=0;
 
        MPI_Init(&argc, &argv);
        MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 
        if(rank == root) {
           buf = 777;
        }
 
        printf("[%d]: Before Bcast, buf is %d\n", rank, buf);
 
        /* everyone calls bcast, data is taken from root and ends up in everyone's buf */
        MPI_Bcast(&buf, 1, MPI_INT, root, MPI_COMM_WORLD);
 
        printf("[%d]: After Bcast, buf is %d\n", rank, buf);
 
        MPI_Finalize();
        return 0;
}

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