Fortran and C
•include mpif.h
•Call MPI_xxx(…,ierr)
•Case insensitive
•Array storage column major •a(1,1),a(2,1),a(3,1)…contiguous
•#include mpi.h
•rc = mpi_xxx(….)
•    rc = MPI_SUCCESS
•Case sensitive
•Array storage row major •a(1,1),a(1,2),a(1,3)…contiguous