MPI_reduce_bcast

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

// C:\Users\Dawid\source\repos\mpi_3\x64\Debug\
//mpiexec -n 10 *.exe
int main(int argc, char** argv) {

    MPI_Init(&argc, &argv);
    int data = 1;

    int world_size;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);
    int rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    //MPI_Barrier(MPI_COMM_WORLD);
    MPI_Bcast(&data, 1, MPI_INT, 0, MPI_COMM_WORLD);
    if( rank!= 0 )
        data *= rank;
    printf("\nprocess: #%d recv: %d", rank, data);

    int globalSum = 0;
    int localSum = (rank+1);

    //funkcja zbiera dane z procesów konunikatora do wybranego root'a
    MPI_Reduce(&localSum, &globalSum, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    printf("proc %d globalSum: %d", rank, globalSum);
    if (rank == 0) {
        printf("reduced value: %d", globalSum);
    }



    MPI_Finalize();
}