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There a set of predefined constants in include files for each language and these include:
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MPI_SUCCESS -- succesful return code
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MPI_COMM_WORLD (everything) and MPI_COMM_SELF(current process) are predefined reserved communicators in C and Fortran
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Fortran elementary datatypes are:
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MPI_INTEGER, MPI_REAL, MPI_DOUBLE_PRECISION, MPI_COMPLEX, MPI_DOUBLE_COMPLEX, MPI_LOGICAL, MPI_CHARACTER, MPI_BYTE, MPI_PACKED
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C elementary datatypes are:
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MPI_CHAR, MPI_SHORT, MPI_INT, MPI_LONG, MPI_UNSIGNED_CHAR, MPI_UNSIGNED_SHORT, MPI_UNSIGNED, MPI_UNSIGNED_LONG, MPI_FLOAT, MPI_DOUBLE, MPI_LONG_DOUBLE, MPI_BYTE, MPI_PACKED
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