MPI+C++版helloworld

好的，以下是MPI+C++版helloworld的代码：

#include <mpi.h>
#include <iostream>

int main(int argc, char** argv) {
    MPI_Init(&argc, &argv);

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

    std::cout << "Hello world from process " << rank << " of " << size << std::endl;

    MPI_Finalize();
    return 0;
}