exiting

[YasserSalama]

How would I go about making it so a user can press one key at anytime during a program, and the program will close?
I tried doing something along these lines, but it didn't really work out:

code:

loop if var = "n" then exit end loop

All that did was wait for me to press "n" then it would go onto the rest of my program...

Any help would be appreciated!

Thanks
-Yasser

[jinjin]

You'd have to use the Input.Keydown function for that.

Check Input.KeyDown in the Turing help file for more info.

Here is some pseudo-code to start you off:

var (something) : array char of boolean
loop
exit when key input is (something)
end loop

[YasserSalama]

Okay, thanks for your help. I'll try and look it up and figure it out.

[YasserSalama]

I'm having some trouble figuring out the actual command. I have something like this:

code:

loop         var chars : array char of boolean         Input.KeyDown (chars)         if chars ('t') then             exit         end if %PROGRAM end loop

This doesn't seem to work. I'm not sure how I would go about doing it jinjin's way either. The command just seems confusing to me.

[Sean]

Turing:

var answer : string loop      %Program      put "Would you like to exit? (Y/N)"      get answer      if answer = "Y" or answer = "y" then           exit      end if end loop

You need your program to be looping before hand, and doing what it needs, then have your exit at the end of the program, or where ever you wish to exit it from.

[YasserSalama]

I appreciate your help Sean, but I was looking for something where it wasn't a question, but anytime during the program they can just press a key that is already pre-determined by me and it will exit.

So at the beginning of the program, I will say,
"If at anytime you would like to quit the program, press N." This would make it so during the program if they want to exit, they can just press n and it will exit without having to ask a question.

It might sound confusing because I can't explain that well, but I hope it clears somethings up!

[richcash]

What is wrong with your last code snippet, it should work? Did you get an error?

If the rest of your program has a loop in it then that might be a reason it's not working. Post if that is the case.

[YasserSalama]

Yea my program is pretty long. It has for loops in it and getch commands for any button on the keyboard. That might be the problem, but I don't know how to get around it.

[richcash]

You have to check for the key being pressed in every loop. Make a new boolean variable set to false outside any loops. If in any of your loops the certain key is pressed, then set this boolean variable to true. Now, at the end of every loop in your program put exit when boolean_variable_name.

Try to implement that and see if it works.

[andrew.]

How about this.

Turing:

var window : int window := Window.Open ("graphics:max,max") var chars : array char of boolean loop     %PROGRAM     Input.KeyDown (chars)     if chars (KEY_ALT) and chars (KEY_F4) then         Window.Close (window)         exit     end if end loop

So I open a window. And when I press ALT and F4, the window closes and the program exits.

I posted this before seeing rickcash's post. This is what he means.

Turing:

var closeprogram : boolean := false loop     %PROGRAM     Input.KeyDown (chars)     if chars (KEY_ALT) and chars (KEY_F4) then         Window.Close (window)         exit closeprogram := true     end if end loop if closeprogram=false then     loop     %MORE PROGRAM         Input.KeyDown (chars)         if chars (KEY_ALT) and chars (KEY_F4) then             Window.Close (window)             exit         end if     end loop end if

[gitoxa]

You guys should be using an 'exit when <cond>' rather than an if, with an exit inside. It's better coding conventions, and easier to read.