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C******************************************************************************

C FILE: omp_reduction.f

C DESCRIPTION:

C   OpenMP Example - Combined Parallel Loop Reduction - Fortran Version

C   This example demonstrates a sum reduction within a combined parallel loop

C   construct.  Notice that default data element scoping is assumed - there

C   are no clauses specifying shared or private variables.  OpenMP will

C   automatically make loop index variables private within team threads, and

C   global variables shared.

C AUTHOR: Blaise Barney  5/99

C LAST REVISED:

C******************************************************************************

      PROGRAM REDUCTION

      INTEGER I, N

      REAL A(100), B(100), SUM

!     Some initializations

      N = 100

      DO I = 1, N

        A(I) = I *1.0

        B(I) = A(I)

      ENDDO

      SUM = 0.0

!$OMP PARALLEL DO REDUCTION(+:SUM)

      DO I = 1, N

        SUM = SUM + (A(I) * B(I))

      ENDDO

      PRINT *, '   Sum = ', SUM

      END