NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part1/7321

Text File | 1996-08-05 | 1.6 KB | 79 lines

Path: news.dseg.ti.com!news
From: [e-mail] (Geoffrey Rubin)
Newsgroups: comp.lang.c++
Subject: Re: [HLP] Easy Problem w/ Classes!
Date: 22 Feb 1996 18:46:14 GMT
Organization: AWP
Message-ID: <4gidlm$[e-mail]>
References: <4gfn3v$[e-mail]>
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In article <4gfn3v$[e-mail]>, [e-mail] says...
>
>Hello all
>  Heres a little problem that I need help with.
>
>// Point.h contains
>Class Point {
>private: int x;
>         int y;
>
>public: Point();
>}
>
>// LineSeg.h contains
>class LineSeg{
>private:
>        Point end;
>        Point start;
>public:
>        LineSeg();
>}
>
>// LineSeg.C contains
>LineSeg::LineSeg()
>{
> Point.end.x=0;  // Are these valid?
> Point.end.y=0;  // What do I need to add/del here?
> Point.start.x=0;
> Point.start.y=0;
>}
>
>Basically, LineSeg() is supposed to set starting and ending
>points to zero. Compiler goes berserkoid .. .
Since x and y are private members of Point, you can not access them
in LineSeg. You can add other versions of your constructor to initialize
x and y such as:
  Point(int TheX ...)
and initialize them like:
  Point end(0,0) ; ...

Or you can add other methods to Point to set x and y values
such as:
class Point
{
  ...
  public:
    void SetX(int TheX) ;
}

and then use them:

  end.SetX(0) ;

Or you can make x and y public members (not recommended)
and do the following in LineSeg:

   end.x = 0 ;
   start.y = 0 ;

But you can never do the following!!!:
  Point.end.x=0;

Geoffrey