Printing a backspace

[Leima]

Hi, I'm trying to code the functionality of a cellphone keyboard, where have to press key '2' three times in order to get letter 'C' and so on. Every time the user types a character it is printed to the screen using putchar(). What I cant do is print a backspace, so that the the cursor goes back one space and the letter on that space can be deleted. I tought if I used "putchar(0x08)" it would work, but it doesn't, when I do that the cursor goes forward. I'm using a switch loop to see what key the user pressed, here's the code for the case when the backspace key (B) is pressed

case 'B':  	if (pos > 0) {
		        putchar(0x08);
			pos --;
			count = 0;
		}
		break;

But as i said, it just prints a space after the last input, instead of going back. So I would appreciate any help on how to do this. Also, I'm trying not to use gotoxy to go back and erase characters, so that the function can be used no mather what the coordinates are.

Tnx for any help.

[tabstop]

I guess the questions are
(1) what system (compiler, etc.) are you using?
(2) why aren't you using the backspace character \b?

[Leima]

(1) what system (compiler, etc.) are you using?

First of all, tnx for the reply, second:
I'm using Turbo C++ versión 3.0 but the program I'm writing is a .C file.

(2) why aren't you using the backspace character \b?

The same thing happens if use that, you mean like :

case 'B':  	if (pos > 0) {
				putchar('\b');
				pos --;
				count = 0;
		}
		break;

It still just prints a space.

[tabstop]

Then perhaps Turbo is somewhat more broken than I thought. Using gcc-mingw, the code

#include <stdio.h>
#include <stdlib.h>

int main(void) {

    putchar('T');
    putchar('h');
    putchar('i');
    putchar('s');
    putchar('\b');
    putchar('n');
    return 0;
}

prints Thin as you would want. If it doesn't for you, then I would suggest getting a real compiler (many good ones are available for free, including gcc-mingw (as in Code::Blocks) or MS Visual Studio Express).

[Leima]

I tested that code and it actually does print "Thin", so I guess the compiler's good. It must be something I'm not doing right so I'll check that now.

Tnx for your help!