Re: [Dev-C++] character buffering with getch() and gets()

[Jon K. <rc...@cr...>]

> Problem1
> The getchar() and getc() functions are both macro's and leave a char (i
> think line feed char = 10) in the buffer. getch() and getche() are both
DOS
> only functions but do not leave a char in the buffer. Unless you are
worried
> about portability I would use one of them.Otherwise use the scanf()
function
> to read in a line of code .
> scanf("%d", &choice); It will not echo so if you want to see your input
you
> must writ the char back to the stdio.

    As defined in Dev-Cpp's conio.h file, getch() is a macro for getchar(),
not the other way around.  Both getchar() and gets() have actual prototypes
in stdio.h.  Scanf() does indeed echo to the screen.  Finally,
getch()/getche() were the functions that were giving me problems to begin
with

> Problem2
> For reading from the stdin the best way is to use a loop:
> char    ch;
> char    string[82];
> int        i=0;
> do
> {
>     ch =getch();
>     string[i++] = ch;
> }while(ch != '\n" || i <= 80)

    Er...  I was hoping to avoid doing my own single-line editor...  I'd
like the program to have the ability to backspace/edit and the like, not
just suck in characters.

> hope this helps.

    Thanks for your suggestions tho

        -- Jon

> ---- Original Message -----
> From: "Ioannis Vranos" <no...@ya...>
> To: <dev...@li...>
> Sent: Monday, November 13, 2000 9:14 AM
> Subject: RE: [Dev-C++] character buffering with getch() and gets()
>
>
> >
> > > -----Original Message-----
> > > From: dev...@li...
> > > [mailto:dev...@li...]On Behalf Of Jon
Keim
> > > Sent: Monday, November 13, 2000 11:39 AM
> > > To: Dev...@li...
> > > Subject: [Dev-C++] character buffering with getch() and gets()
> > >
> > >
> > > problem 1:
> > >     I'm developing a piddly little program from a learning book, and
in
> my
> > > main(), I've got a statement to get the user's choice from a menu
> > > that looks
> > > like this:
> > >
> > > choice = getche();
> > >
> > >     it takes the '1' character required and successfully activates a
> > > particular function.  Once inside the function, however, I have this
> input
> > > statement, to prompt for and get some data for the string "title" in a
> > > struct array.
> > >
> > > printf( "Book title : " );
> > > gets( catalog[ recordCount ].title );
> > >
> > >     Simple, right?  Nope.  The prompt comes up
> > >
> > > Book title : 1
> > >
> > >     the gets() reads the 1 from the getche() up in the main
function...
> I
> > > have tried all sorts of odd things, placing getch()'s and getche()'s
> > > after/before statements to clear the buffer, substituted a scanf(
"%s",
> >
> >
> > getch(), getche() are not standard C/C++ functions. Better use getchar()
> or
> > getc(stdin) in the following style:
> >
> > choice=getchar();
> > getchar();
> >
> > getchar() is equivalent of getc(stdin) so use whatever one you like. The
> > second getchar() is used to clear '\n' (the enter) from the stdin.
> >
> >
> > > foo ) for the gets().  Even tried testing to see if there was
something
> in
> > > the buffer with kbhit(), and that comes up negative.  Any idea why
this
> is
> > > happening?
> >
> >
> > Implement my above suggestion.
> >
> >
> > > ---------------------------------------------------------------------
> > >
> > > problem 2:
> > >     any idea how to limit an inputted string to 80 characters and
still
> be
> > > able to read spaces?  I tried the following in my above program and it
> > > screwed things up FAR worse...
> > >
> > > scanf( "%80[^\n]", string );
> >
> > One way is fgets(): fgets(string, 80, stdin);
> >
> > It reads 79 characters, and places '\0' at the end.
> >
> >
> > Ioannis




________________________________________________________
                           1stUp.com - Free the Web
   Get your free Internet access at http://www.1stUp.com