getch problem

[QWERTYman]

#include <iostream>
#include <conio.h>
using namespace std;

bool redo();

int main()
{
    top:
    cout << "Hello, world!\n";
    redo();
    if(redo())
    goto top;
}

bool redo()
{
    cout << "Do again? [y/n] (n)\n";
    char ch;
    if( !_kbhit() ){
    ch = getch();
    if(ch == 121)
    return true;
    else
    return false;}
}

Interestingly, here is the output:

Hello, world!
Do again? [y/n] (n)
(user types n)
Do again? [y/n] (n)
*user types n*
*exit*

This is not expected. Any ideas?

[Duthomhas]

It is because <conio.h> is ancient, and it is clashing with the DOS terminal emulator's handling of such requests -- The windows console does that when switching back and forth between line-buffered and unbuffered input.

Alas.

[QWERTYman]

Well, any known ways to do unbuffered input with a different header file?

[mahlerfive]

I don't see the problem... the output you got is what is expected..
You call the function twice, both times the user entered "n", so both times it returned false.

[Duthomhas]

Use Curses.

PDCurses (DOS, Win32, etc)
http://pdcurses.sourceforge.net/

NCurses (POSIX)
http://www.gnu.org/software/ncurses/

The MinGW suite has a precompiled pdcurses package you can simply download and unpack.

You should remember this too
http://www.cplusplus.com/forum/beginner/1988/page2.html#msg10636
Remember, mixing line-buffered and unbuffered input in a single program confuses users.

Hope this helps.

[QWERTYman]

Oh, mahlerfive.
Stupid me.