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

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On 12/30/16 01:46 PM, Malcolm McLean wrote:
> 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.

Didn't you advocate the use of goto over other control structures in 
structured programming?

-- 
Ian

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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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