ALLOCATABLE Arrays can be defined at runtime with variable sizing
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REAL, ALLOCATABLE :: u(:,:) , f(:,:)
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ALLOCATE ( u(0:nx,0:ny) , f(1:27,0:ny) )
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One can define POINTER and TARGET attributes which can be used like REAL, DIMENSION etc.
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=> operator allows one to set a POINTER to "point to" a TARGET
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Arguments of a subroutine need NOT define array dimensions in subroutine as these as passed by calling program in data descriptor
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Local arrays are created on stack and bounds maybe non constant and evaluated at procedure entry
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