Programming Forums > Application Development > C++

Hotepric · Apr 8th, 2005, 3:54 AM

I'm supposed to make a program that beeps everytime any key is pressed. I thought this would be easy with an if or maybe even a do while and kbhit() but I can't get any output from this program and I can only get this code to compile in borland C++ builder 6 I tried it in dev ++ and it didn't recognize the beep command. Any insight would be appreciated thanks in advance.

#include "windows.h"
#include <stdio.h>
#include <iostream.h>
#include <conio.h>

int main(){
if(kbhit())
{
Beep( 800, 600 );
}
}

Cerulean · Apr 8th, 2005, 7:25 AM

conio.h is a non-standard header. It is a borland specific thing and should be avoided at all costs. I would suppose kbhit and/or Beep is defined there. So Dev-C++ is not happy.
With that said, the reason it's not working is because if(kbhit()) only checks for a keyboard hit when the application starts running. It doesn't get one so the application dies. You could do something like:

(Toggle Plain Text)

bool keyboardHit = false;
while(!keyboardHit) {
    if(kbhit()) {
        Beep(800, 600);
        keyboardHit = true;
    }
}

That would beep when you pressed a key and then exit.

As I mentioned, conio is a non-standard header. Look for a blocking way to read a key from the keyboard and then write a '\a' character to the console (alarm beep).

duomax51 · Apr 8th, 2005, 10:31 AM

You might not have the right libary for Dev C++ I only use one kind of compiler and libary. So I am not sure if this is possible.

Infinite Recursion · Apr 8th, 2005, 2:16 PM

i didn't think conio.h was a borland specific header?!? Doesn't matter much to me though, either way because I rarely use it.

Hotepric · Apr 9th, 2005, 12:08 AM

Thanks for the response, and I'm working at learning more but the book I have is horrible. I need it for a class at school though because all the tests are based off of it. Its really outdated and for Borland Turbo C++, many of the instructions are including borland libraries. Anyways thanks again see you around.

anandt4u · Apr 9th, 2005, 12:30 AM

no i dont think conio.h is borland specific. I have used it in Turbo C as well. But in gcc it does not work

anyway why not try "\a" ..even that gives a beep sound

Cerulean · Apr 9th, 2005, 4:54 AM

Quote:

no i dont think conio.h is borland specific. I have used it in Turbo C as well.

Well gee.. who is Turbo C made by? Borland.. conio.h is a non-standard header - it's not defined by the ANSI C/C++ standards.
Actually the digital mars compiler includes it too but last time I checked that compiler is far too outdated to be considered useable.

Ooble · Apr 9th, 2005, 6:54 AM

Visual C++ includes it as well. But as people have said, it's non-standard.

Apr 8th, 2005, 3:54 AM	#1
Hotepric Newbie Join Date: Nov 2004 Posts: 2 Rep Power: 0	Simple Program, kbhit() and beep I'm supposed to make a program that beeps everytime any key is pressed. I thought this would be easy with an if or maybe even a do while and kbhit() but I can't get any output from this program and I can only get this code to compile in borland C++ builder 6 I tried it in dev ++ and it didn't recognize the beep command. Any insight would be appreciated thanks in advance. #include "windows.h" #include <stdio.h> #include <iostream.h> #include <conio.h> int main(){ if(kbhit()) { Beep( 800, 600 ); } }

Apr 8th, 2005, 7:25 AM	#2
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	conio.h is a non-standard header. It is a borland specific thing and should be avoided at all costs. I would suppose kbhit and/or Beep is defined there. So Dev-C++ is not happy. With that said, the reason it's not working is because if(kbhit()) only checks for a keyboard hit when the application starts running. It doesn't get one so the application dies. You could do something like: (Toggle Plain Text) bool keyboardHit = false; while(!keyboardHit) { if(kbhit()) { Beep(800, 600); keyboardHit = true; } } bool keyboardHit = false; while(!keyboardHit) { if(kbhit()) { Beep(800, 600); keyboardHit = true; } } That would beep when you pressed a key and then exit. As I mentioned, conio is a non-standard header. Look for a blocking way to read a key from the keyboard and then write a '\a' character to the console (alarm beep).

Apr 8th, 2005, 10:31 AM	#3
duomax51 Newbie Join Date: Apr 2005 Posts: 12 Rep Power: 0	You might not have the right libary for Dev C++ I only use one kind of compiler and libary. So I am not sure if this is possible. __________________ :D :eek: :cool: Joe Thompson

Apr 8th, 2005, 2:16 PM	#4
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,467 Rep Power: 8	i didn't think conio.h was a borland specific header?!? Doesn't matter much to me though, either way because I rarely use it. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Apr 9th, 2005, 6:54 AM	#8
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Visual C++ includes it as well. But as people have said, it's non-standard. __________________ Me :: You :: Them

Apr 9th, 2005, 12:08 AM	#5
Hotepric Newbie Join Date: Nov 2004 Posts: 2 Rep Power: 0	Thanks for the response, and I'm working at learning more but the book I have is horrible. I need it for a class at school though because all the tests are based off of it. Its really outdated and for Borland Turbo C++, many of the instructions are including borland libraries. Anyways thanks again see you around.

Apr 9th, 2005, 12:30 AM	#6
anandt4u Newbie Join Date: Feb 2005 Posts: 22 Rep Power: 0	no i dont think conio.h is borland specific. I have used it in Turbo C as well. But in gcc it does not work anyway why not try "\a" ..even that gives a beep sound

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Programming Forums > Application Development > C++

Simple Program, kbhit() and beep