Re: subset function for string in c++

August Karlstrom wrote
(in article <XSE_e.147284$dP1.504155@xxxxxxxxxxxxxxx>):

> Randy Howard wrote:
>> August Karlstrom wrote
>>> puzzlecracker wrote:
>>>
>>>> basically, I need to find out wether charecters in string a are subset
>>>> of string b..
>>>>
>>>>
>>>> example
>>>>
>>>>
>>>> a: rx b:rwx
>>>> that shall return true.
>>>>
>>>
>>> As this group is language independent i chose to write an implementation
>>> in Oberon:
>>>
>>> PROCEDURE Subset(a, b: ARRAY OF CHAR): BOOLEAN;
>>> VAR j, k: LONGINT;
>>> BEGIN
>>> j := 0;
>>> WHILE a[j] # 0X DO
>>> k := 0;
>>> WHILE (b[k] # 0X) & (b[k] # a[j]) DO INC(k) END;
>>> IF b[k] = 0X THEN RETURN FALSE END;
>>> INC(j)
>>> END;
>>> RETURN TRUE
>>> END Subset;
>>>
>>>
>>
>>
>> Wow. Ben's version sure seems a lot clearer. :-)
>
> Since the original poster wrote to comp.programming I assumed he/she was
> interested in an algorithm.

I was making a comment on the wordiness of Oberon, not on what
language the solution was in, and it was mostly tongue in cheek.
I would expect a modern language to have a bit more in the way
of standard string support and not have to roll it from scratch,
or is there a more direct way of doing it with Oberon builtins?

> Otherwise comp.lang.c++ is be the appropriate group to consult.

Looked pretty much like conventional C to me. strspn conforms
to ISO C90 according to man pages on this box. :-)

>> I'm having pascal flashbacks, make it stop.
>
> The similarities between Pascal and Oberon is mostly at the syntactic
> level.

Precisely my point. :-)

--
Randy Howard (2reply remove FOOBAR)

.

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