Re: subset function for string in c++

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;
>
> August

Or,

' Returns true if A is a subset of B, false otherwise.
Function is_subset(a As String, b As String) As Boolean
is_subset = InStr(a, b) > 0
End Function

or, then again,

logical function is_subset(string, substr) result(flg)
character (len=*) :: string, substr

flg = index(string,substr)>0
end function

:)
.

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