Re: Program crashes at end

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#453

From: Emmanuel Delahaye
Date: Thu, 30 May 2002 19:23

50 lines
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In 'borland.public.cpp.turbocpp', "SKAS" <f93c0532@yahoo.com> wrote in
news:acv9rh$sopon$1@ID-31123.news.dfncis.de: 

> I've written a class for string datatype.  The program runs fine but

It doesn't works fine because it invokes an undefined behaviour.

<...>

> #include <iostream.h>
> #include <conio.h>
> #include <stdio.h>
> #include <string.h>
> 
> class string
> {
>  private:
>       char *head;
>       int len;
>  public:
>       string()
>    {
>    }

What is this one made for?
 
>   string(int l)
>   {
>    len=l;
>    head=new char[len];
>   }
> 
>   string(char a[])
>   {
>    strcpy(head,a);

'head' was never initialized. You probably want:

    len = strlen (a) + 1;
    head = new char[len];
    strcpy (head, a);

>   }

-- 
-ed- emdel at noos.fr
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From: Emmanuel Delahaye <emdelNOSPAM@noos.fr>
Newsgroups: alt.comp.lang.learn.c-c++,borland.public.cpp.turbocpp,comp.lang.c++
Subject: Re: Program crashes at end
Date: 30 May 2002 19:23:33 GMT
Organization: World Company
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