Extent of a dimension

The extent of a dimension is the number of elements in that dimension, computed as the value of the upper bound minus the value of the lower bound, plus one.

INTEGER, DIMENSION(5) :: X     ! Extent = 5
REAL :: Y(2:4,3:6)             ! Extent in 1st dimension = 3
                               ! Extent in 2nd dimension = 4

The minimum extent is zero, in a dimension where the lower bound is greater than the upper bound.

IBM extension begins The theoretical maximum number of elments in an array is 2**63-1 elements. Hardware addressing considerations make it impractical to declare any combination of data objects with a total size in bytes that exceeds this value. IBM extension ends

Different array declarators associated by common, equivalence, or argument association can have different ranks and extents.

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