Question

I have a structure :

    struct vertex
    {
     double a; double b;
    }

    struct polygon
    {
     int numofVertex;
     vertex v[10];
    }

How to send this nested structure in MPI using MPI_Send?

Answer 1

Since your structure does not contain any pointers, it’s easily possible.

MPI_Send(ptr_to_your_struct, sizeof(struct polygon), MPI_BYTES, ...);