All, Thats why it is important to understand how a language works. I was mentoring a bunch until furloughed due to COVID-19, but i digress. I taught understand the language and its underpinnings.
Scott On Wed, Apr 8, 2020 at 9:51 PM David Crayford <dcrayf...@gmail.com> wrote: > As Martin previously mentioned some languages implement proper tail > calls so they effectively turn recursion into iteration > https://www.lua.org/pil/6.3.html. > > This is a great optimization as recursion is often the most elegant > method to implement many data structures and algorithms (quicksort, > binary trees etc). > > > On 2020-04-09 12:40 AM, Frank Swarbrick wrote: > > Yes, very verbose. > > And yes, recursion is possible, but you must specify "IS RECURSIVE" on > the PROGRAM-ID. Not sure what having nested programs has to do with that, > though. > > > > ________________________________ > > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on > behalf of David Crayford <dcrayf...@gmail.com> > > Sent: Tuesday, April 7, 2020 7:44 PM > > To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU> > > Subject: Re: Why rip out COBOL when you can modernize key applications? > - Weirdware > > > > Wow, and some people criticize Java for being verbose! > > > > So using nested programs one can implement recursion in COBOL which you > > couldn't do before without using a table stack. > > > > On 2020-04-08 5:14 AM, Frank Swarbrick wrote: > >> Nested subroutines. > >> > >> Small example: > >> > >> ID DIVISION. > >> PROGRAM-NAME. MAINPROG. > >> [...] > >> PROCEDURE DIVISION. > >> CALL 'NESTED-PROGRAM-1' > >> GOBACK. > >> > >> ID DIVISION. > >> PROGRAM-ID. NESTED-PROGRAM-1. > >> DATA DIVISION. > >> WORKING-STORAGE SECTION. > >> 01 LOCAL-VAR-1 PIC X. > >> [...] > >> PROCEDURE DIVISION. > >> DISPLAY 'IN NESTED-PROGRAM-1' > >> GOBACK. > >> > >> END PROGRAM NESTED-PROGRAM-1. > >> > >> END PROGRAM MAINPROG. > >> > >> ________________________________ > >> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on > behalf of David Spiegel <dspiegel...@hotmail.com> > >> Sent: Tuesday, April 7, 2020 2:58 PM > >> To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU> > >> Subject: Re: Why rip out COBOL when you can modernize key applications? > - Weirdware > >> > >> Hi Frank, > >> Thank you for that information. > >> (All the COBOL I support(ed) didn't contain these and neither did my > >> university courses in the '70s.) > >> > >> If I wanted to look them up, which keyword(s) would I use? > >> > >> Thanks and regards, > >> David > >> > >> On 2020-04-07 15:49, Frank Swarbrick wrote: > >>> Internal subroutines and local variables have been supported since > COBOL 1985 (VS COBOL II era). > >>> They're not ideal, but they do exist. > >>> > >>> ________________________________ > >>> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on > behalf of David Spiegel <dspiegel...@hotmail.com> > >>> Sent: Tuesday, April 7, 2020 12:58 PM > >>> To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU> > >>> Subject: Re: Why rip out COBOL when you can modernize key > applications? - Weirdware > >>> > >>> How about no internal subroutines with local variables? > >>> > >>> On 2020-04-07 14:47, Bob Bridges wrote: > >>>> I used to bad-mouth COBOL, and I still prefer languages that are less > wordy. But I came somewhat reluctantly to see that it has its strengths. > The one I think most important is that it encourages even novice > programmers to organize their logic in what we used to call a "top-down" > manner: This paragraph accomplish a certain task by executing paragraphs > one through three, then two more, and this subparagraph executes > subsubparagraphs, and so on. Forms good habits, I think. > >>>> > >>>> --- > >>>> Bob Bridges, robhbrid...@gmail.com, cell 336 382-7313 > >>>> > >>>> /* My life is in the hands of any fool who can make me lose my > temper. -driving motto */ > >>>> > >>>> -----Original Message----- > >>>> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of scott Ford > >>>> Sent: Tuesday, April 7, 2020 12:55 > >>>> > >>>> I learned Assembler first and then Cobol and then some PL/1. I > always felt each language had its strengths and weaknesses and all were > like tools in a toolbox. > >>>> > >>>> ---------------------------------------------------------------------- > >>>> For IBM-MAIN subscribe / signoff / archive access instructions, > >>>> send email to lists...@listserv.ua.edu with the message: INFO > IBM-MAIN > >>>> . > >>> ---------------------------------------------------------------------- > >>> For IBM-MAIN subscribe / signoff / archive access instructions, > >>> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > >>> > >>> ---------------------------------------------------------------------- > >>> For IBM-MAIN subscribe / signoff / archive access instructions, > >>> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > >>> . > >> ---------------------------------------------------------------------- > >> For IBM-MAIN subscribe / signoff / archive access instructions, > >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > >> > >> ---------------------------------------------------------------------- > >> For IBM-MAIN subscribe / signoff / archive access instructions, > >> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- *IDMWORKS * Scott Ford z/OS Dev. “By elevating a friend or Collegue you elevate yourself, by demeaning a friend or collegue you demean yourself” www.idmworks.com scott.f...@idmworks.com Blog: www.idmworks.com/blog *The information contained in this email message and any attachment may be privileged, confidential, proprietary or otherwise protected from disclosure. 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