All MPI routines are prefixed by MPI_
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C is always MPI_Xnnnnn(parameters) : C is case sensitive
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Fortran is case insensitive but we will write MPI_XNNNNN(parameters)
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MPI constants are in upper case as MPI datatype MPI_FLOAT for floating point number in C
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Specify overall constants with
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#include "mpi.h" in C programs
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include "mpif.h" in Fortran
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C routines are actually integer functions and always return a status (error) code
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Fortran routines are really subroutines and have returned status code as argument
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Please check on status codes although this is often skipped!
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