Re: [Dev-C++] String Functions

Thanks Michael and Kurt!

Michael, is this:

"You also don't handle the case where
the character does not exist."

left to the user to take care of?

TIA,

Linda

-----------------------------------------
----- Original Message ----- 
From: "Michael Potter" <mdp...@ya...>
To: <dev...@li...>
Sent: Tuesday, May 01, 2001 5:02 PM
Subject: Re: [Dev-C++] String Functions


> Sorry, none of this was tested but, it may give you a
> hand. 
> 
> 1) You do not terminate the loop once you find the
> first instance. You also don't handle the case where
> the character does not exist. TRY:
> 
> int String::firstcharfind (const char& charfind) const
>  //#2
> {  
> int i;
> for (i = 0; i < current_length; i++)
>     {
>              if (sequence[i] == charfind)
>           return i;
>     }
>     return -1;
> }
> 
> 2) I am assuming your string arrays are NULL
> terminiated.
> TRY:
> 
> bool String::charsdelete (int begin, int end)  //#4
> {
> if ((begin < 0) || 
>     (begin >= current_length) ||
>     (end >= current_length) ||
>             (begin > end)
> return false;
> 
> int lengthToMove = (current_length - end); 
> 
> 
> memcpy(&sequence[begin],&sequence[end+1],lengthToMove);
> 
> current_length = current_length - ((end - begin) +
> 1);
> 
> return true;
> }
> 
> 
> 
> 
> 
> 
> --- Linda Hohenstein <lz...@sp...> wrote:
> > Hi All,
> > 
> > Can anyone help me with a couple of functions I am
> > having problems with in the String class I am
> > writing?  (It runs.)
> > 
> > The following code is supposed to return the first
> > instance of a character, but is returning the last
> > (11):
> > 
> > int String::firstcharfind (const char& charfind)
> > const  //#2
> > {  size_t i;
> >    int position;
> >    for (i = 0; i < current_length; i++)
> >    {
> >       if (sequence[i] == charfind)
> >          position = i;
> >    }
> >    return position;
> > }
> > 
> > This is called by: 
> > 
> > //#2
> >    char testing [28] = "Delete the extra word
> > word.";
> >    String demostring (testing);
> >    cout << demostring.firstcharfind ('e') << endl;
> > 
> > The second function is supposed to delete one of the
> > "word"s in the above function:
> > 
> > bool String::charsdelete (int begin, int end)  //#4
> > {
> >    int i;
> >    if ((begin < 0) || (end > current_length) ||
> > (begin > end))
> >       return false;
> >    int partdeleted = (end - begin) + 1;
> >    for (i = begin; i <= current_length - partdeleted
> > ; i++)
> >    {
> >       sequence[i] = sequence[partdeleted + 1];
> >    }
> >    current_length = current_length - partdeleted;
> >    allocated = allocated - partdeleted;
> >    return true;
> > }
> > 
> > It's called by:
> > 
> > //#4
> >    demostring.charsdelete (18, 22);
> >    cout << demostring << endl;
> > 
> > The output is:
> > 
> > Delete the extra w      ord.
> > 
> > I'd appreciate any help anyone can give - it's the
> > last class for my Data Structures class.
> > 
> > TIA,
> > 
> > Linda
> > 
> > 
> > 
> > 
> > 
> 
> 
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