Re: Multi-field dynamic array

        * Jerry C. Adams
*iSeries Programmer/Analyst
B&W Wholesale Distributors, Inc.* *
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Jim Wiant wrote:

Ok, you got me on this one.

I'm pretty certain (although I can't prove it because the compiler and
code are long gone) that under MicroFocus COBOL for the PC that I did
prove that the system did physically expand the array when I defined it
as varying between x and y.
Memory would decrease if I increased y. I needed this cause I crammed
400,000 lines of COBOL into a 512K PC using dynamic overlays, and I
needed every byte I could get!

However, under the I-SERIES and COBOL ILE I've never tested the actual
physical memory to see if changing the array limits changed anything.
I'll take for granted you're right, and that some 'assumptions' are made
by the compiler.

In the regression and recursion routines I've done it sure 'acts' like
it does truly expand, but that could be just as you said - it's
pretending to.

I'll look forward to giving that a look on this system when I get a
chance.

Thanks

JPW





The bitterness of poor quality remains long after low pricing is

forgotten!

Cautillo, Leon M.




>> Also, you could consider calling an ILE CBL routine - because CBL
supports dynamic array. (And yes, I still like COBOL) - *LOL*

I hate to disillusion you, but no it doesn't.  It just pretends to.

It

always allocates the storage for the maximum size possible.  Since the

point

of a dynamic array is to reduce memory utilization this nullifies the
impact.

The only real difference is that any bound checking is done against

the

current limit and not against the maximum.  Many COBOL compilers don't

even

check the bounds anyway so even that is of limited utility.

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