> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of John McKown
>
> On Tue, Feb 18, 2014 at 9:54 AM, Ron Thomas <[email protected]> wrote:
>
> > Hello,
> >
> > Here is the definition in one our programs
> >
> > ITMLNG DS XL2 BIT MAP LENGTH.
> > ITMAP DS XL1250 STORE BIT MAP.
> >
> > Here 1250 , storage allocation means data for 8 stores ie 1250 * 8,
> > i.e each bit has the information whether the store is closed or opened.
> >
> > Now if we modify to 12500, can ITMLNG , which is the length of the bit
> > data can hold the length ?
> >
> > Thanks,
> > Ron T
> >
> >
> It worries me that you need to ask. But based on the comments on the
> definitions as well as your
> words, it appears that ITMAP is a bit map of stores (business locations). In
> an XL2 count field, you
> can have a signed value of -32_767 to 32_767 or an unsigned value of 0 to
> 65_535. XL1250 can contain
> 1250*8 or 10_000 bits. An XL12500 would be 10 times as much or
> 100_000 bits. That is too big a value to store in a halfword (XL2 is a
> halfword), even unsigned. The
> largest size, if ITMLNG is unsigned would be
> XL8191 or 65_528 stores, if ITMLNG is signed, that is cut in half (more of
> less) to XL4095, or 32_760 stores.
>
> I would say the answer to the original question is "No".
Both the code comment and the OP explicitly declared ITMLEN to contain a data
length, not a bit count. Data lengths are usually expressed as a number of
bytes, not bits.
Therefore, I submit that John Gilmore got it right the first time.
-jc-
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