text: #include <mpi.h>
  #include <stdio.h>
  
  int main() {
      MPI_Init(NULL, NULL);
      int world_size;
      MPI_Comm_size(MPI_COMM_WORLD, &world_size);
      int world_rank;
      MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
  
      char proc_name[MPI_MAX_PROCESSOR_NAME];
      int len;
      MPI_Get_processor_name(proc_name, &len);
      printf("hello from MPI in C\n");
      MPI_Finalize();
      return 0;
  }