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Re: while loop vs do while loop reading from the file issue

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On Thursday, December 29, 2016 at 9:48:54 PM UTC, Ian Collins wrote:
> On 12/30/16 10:25 AM, Malcolm McLean wrote:
> >
> > You can't have a "loop and a half" and still have a structured program.
> > Sorry, that is abundantly clear to me. The result is not a totally
> > unstructured program, or a "bad" program necessarily, but one which
> > violates a property of structured programming, and essential property,
> > that each block have one point of entry and one point of exit.
> 
> So something like
> 
> while( something )
> {
>    if( doSomething() !=0 )
>      goto error;
>    doSomethingElse();
> }
> 
> error:
> 
> breaks that rule?
> 
Exactly.

The mistake a lot of people make is to think that since structured
programming is "good", "good" programs are structured (in the sense
intended) whilst bad programs are not. 

The while block has two point of exit. So not a "block" in structured
programming terms.

Use of the term "structured" is confusing, since a program written 
according to a different paradigm isn't necessarily "unstructured"
in the sense that it is spaghetti code or has no discernible structure.

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Re: while loop vs do while loop reading from the file issue Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 13:25 -0800
  Re: while loop vs do while loop reading from the file issue Ian Collins <ian-news@hotmail.com> - 2016-12-30 10:48 +1300
    Re: while loop vs do while loop reading from the file issue Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 16:46 -0800
      Re: while loop vs do while loop reading from the file issue Ian Collins <ian-news@hotmail.com> - 2016-12-30 13:51 +1300
        Re: while loop vs do while loop reading from the file issue Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 17:22 -0800
          Re: while loop vs do while loop reading from the file issue Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-13 02:45 -0800
      Re: while loop vs do while loop reading from the file issue BartC <bc@freeuk.com> - 2016-12-30 01:01 +0000
        Re: while loop vs do while loop reading from the file issue Ian Collins <ian-news@hotmail.com> - 2016-12-30 14:04 +1300
        Re: while loop vs do while loop reading from the file issue Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 17:23 -0800
  Re: while loop vs do while loop reading from the file issue asetofsymbols@gmail.com - 2016-12-30 00:56 -0800
  Re: while loop vs do while loop reading from the file issue Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-13 02:41 -0800
    Re: while loop vs do while loop reading from the file issue Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-13 09:59 -0800
      Re: while loop vs do while loop reading from the file issue Gareth Owen <gwowen@gmail.com> - 2017-01-13 18:48 +0000
        Re: while loop vs do while loop reading from the file issue Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 12:08 -0800
          Re: while loop vs do while loop reading from the file issue Gareth Owen <gwowen@gmail.com> - 2017-01-15 23:09 +0000
            Re: while loop vs do while loop reading from the file issue Richard Heathfield <rjh@cpax.org.uk> - 2017-01-15 23:18 +0000
              Re: while loop vs do while loop reading from the file issue Gareth Owen <gwowen@gmail.com> - 2017-01-15 23:37 +0000
              Re: while loop vs do while loop reading from the file issue raltbos@xs4all.nl (Richard Bos) - 2017-01-18 11:32 +0000
                Re: while loop vs do while loop reading from the file issue Gareth Owen <gwowen@gmail.com> - 2017-01-18 21:25 +0000
      Re: while loop vs do while loop reading from the file issue Keith Thompson <kst-u@mib.org> - 2017-01-13 11:54 -0800
      Re: while loop vs do while loop reading from the file issue Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 11:58 -0800

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