# 3.1. Version Number

Up: Version 1.2 of MPI Next: MPI-1.0 and MPI-1.1 Clarifications Previous: Version 1.2 of MPI

In order to cope with changes to the MPI Standard, there are both compile-time and run-time ways to determine which version of the standard is in use in the environment one is using.

The ``version'' will be represented by two separate integers, for the version and subversion:

In C and C++,

        #define MPI_VERSION    1
        #define MPI_SUBVERSION 2

in Fortran,

        INTEGER MPI_VERSION, MPI_SUBVERSION
        PARAMETER (MPI_VERSION    = 1)
        PARAMETER (MPI_SUBVERSION = 2)

For runtime determination,

MPI_GET_VERSION( version, subversion )
OUT version | version number (integer)
OUT subversion | subversion number (integer)

`int MPI_Get_version(int *version, int *subversion)
`

`MPI_GET_VERSION(VERSION, SUBVERSION, IERROR)
INTEGER VERSION, SUBVERSION, IERROR
`

MPI_GET_VERSION is one of the few functions that can be called before MPI_INIT and after MPI_FINALIZE. Its C++ binding can be found in the Annex, Section C++ Bindings for New 1.2 Functions .

Up: Version 1.2 of MPI Next: MPI-1.0 and MPI-1.1 Clarifications Previous: Version 1.2 of MPI

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