So I have an array created by defining with an occurs. Let's say I have
OCCURS 10 TIMES. When it comes to the PERFORM VARYING (or whatever) is
there a way to iterate through the rows in the array without specifying
the same number of rows in the PERFORM, that is, the compiler knowing
how many rows are defined in WORKING-STORAGE, it can limit the number of iterations in the PERFORM?

Bruce

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Bruce Axtens wrote:

So I have an array created by defining with an occurs.

And this is what I ended up with (so far)

IDENTIFICATION DIVISION.

PROGRAM-ID. HelloWorldTests.

ENVIRONMENT DIVISION.

DATA DIVISION.

WORKING-STORAGE SECTION.

01 Hello PIC X(13).

01 WS-CNT PIC 9 VALUE 0.

01 WS-MAX PIC 9 VALUE 0.

01 Tests.

03 Test1.

05 WS-T-Enabled PIC X VALUE '1'.

05 WS-T-Name PIC X(5) VALUE 'Test1'.

05 WS-T-Func PIC X(10) VALUE 'HelloWorld'.

05 WS-T-Answer PIC X(13) VALUE 'Hello, World!'.

03 Test2.

05 WS-T-Enabled PIC X VALUE '0'.

05 WS-T-Name PIC X(5) VALUE 'Test1'.

05 WS-T-Func PIC X(10) VALUE 'HelloWorld'.

05 WS-T-Answer PIC X(13) VALUE 'Hello, World!'.

01 TestGroup REDEFINES Tests.

03 TestList OCCURS 2 TIMES.

05 WS-TL-Enabled PIC X.

05 WS-TL-Name PIC X(5).

05 WS-TL-Func PIC X(10).

05 WS-TL-Answer PIC X(13).

01 TestItem.

03 WS-TI-Enabled PIC X.

03 WS-TI-Name PIC X(5).

03 WS-TI-Func PIC X(10).

03 WS-TI-Answer PIC X(13).

PROCEDURE DIVISION.

COMPUTE WS-MAX = LENGTH OF TestGroup / LENGTH OF Test1.

PERFORM 10-TEST

VARYING WS-CNT

FROM 1

BY 1

UNTIL WS-CNT > WS-MAX

STOP RUN.

10-TEST.

MOVE TestList(WS-CNT) TO TestItem.

IF WS-TI-Enabled = '1'

CALL WS-TI-Func USING BY REFERENCE Hello

IF Hello = WS-TI-Answer

DISPLAY "Pass"

ELSE

DISPLAY "Fail"

END-IF

END-IF.

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In article <shsr2t$r7p$[email protected]>,
Bruce Axtens <[email protected]> wrote:

[snip]

03 TestList OCCURS 2 TIMES.

03 TestList OCCURS WS-NC-2 TIMES.

05 WS-TL-Enabled PIC X.

05 WS-TL-Name PIC X(5).

05 WS-TL-Func PIC X(10).

05 WS-TL-Answer PIC X(13).

01 TestItem.

03 WS-TI-Enabled PIC X.

03 WS-TI-Name PIC X(5).

03 WS-TI-Func PIC X(10).

03 WS-TI-Answer PIC X(13).

01 WS-NUMERIC-CONSTANTS.
05 WS-NC-1 PIC 9 VALUE 1.
05 WS-NC-2 PIC 9 VALUE 2.
05 WS-NC-3 PIC 9 VALUE 3.
etc.

PROCEDURE DIVISION.

COMPUTE WS-MAX = LENGTH OF TestGroup / LENGTH OF Test1.

PERFORM 10-TEST

VARYING WS-CNT

FROM 1

BY 1

UNTIL WS-CNT > WS-MAX

PERFORM 10-TEST
VARYING SUB1 FROM 1 BY 1
UNTIL SUB1 > WS-NC-2.


etc.

DD

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On Wednesday, September 15, 2021 at 1:13:59 AM UTC-4, [email protected] wrote:

So I have an array created by defining with an occurs. Let's say I have OCCURS 10 TIMES. When it comes to the PERFORM VARYING (or whatever) is
there a way to iterate through the rows in the array without specifying
the same number of rows in the PERFORM, that is, the compiler knowing
how many rows are defined in WORKING-STORAGE, it can limit the number of iterations in the PERFORM?

COBOL tables are often defined to be larger than the apparent
need because the number of entries may be variable. That is,
a table may be defined as OCCURS 100, when the number of
entries determined during design may be 1 to 50. Sometimes
designs change.

It is not uncommon to define both a limit and a count for
the number of entries available and used, respectively.
For example,

01 t1-limit comp pic 9(4) value 100.
01 t1-count comp pic 9(4) value 0.
01 t1-index comp pic 9(4) value 0.
01 t1-table.
03 t1-entry occurs 100.
05 (the description of the entry)

When loading a table, one may do something like.

add-entry.
if t1-count not > t1-limit
add 1 to t1-count
move new-entry to t1-entry (t1-count)
else
perform error-proc-t1-no-space
end-if
.

When using PERFORM to find an entry, one may do.

find-entry.
perform varying t1-index from 1 by 1
until t1-index > t1-count
or (whatever search criteria)
end-perform
.

Tables are not just in the WORKING-STORAGE SECTION, they
may be placed in the FILE SECTION, LOCAL-STORAGE SECTION
and LINKAGE SECTION.

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Rick Smith wrote:

On Wednesday, September 15, 2021 at 1:13:59 AM UTC-4, [email protected] wrote:

So best practice then is to oversize the array and read the data in from somewhere, keeping track of how much is read in and then iterating the
table accordingly? I'm fine with that.

I've just begun the COBOL track on https://exercism.org . I learned
COBOL on a VAX-11 back in the early 1980s but never got to use it to
earn a living. I'm hardly the best qualified for creating the track but
I'm giving it my best anyway.

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In article <shul9b$10e$[email protected]>,
Bruce Axtens <[email protected]> wrote:

Rick Smith wrote:

On Wednesday, September 15, 2021 at 1:13:59 AM UTC-4, [email protected] wrote:

So best practice then is to oversize the array and read the data in from >somewhere, keeping track of how much is read in and then iterating the
table accordingly? I'm fine with that.

You've got the general idea down fairly well. Tables are intended to keep small amounts of frequently- and rapidly-needed data available in core (remember core?) so as to cut down the time and I/O needed for file
access. Think of a small shipping company, 700, 800 clients, each of
which has its own discount. How do you process a week's orders and make
sure folks get what they deserve?

DD

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