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Newcomers DBPro Corner / Wait for: Enter

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RoyalBlood
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Posted: 12th Apr 2009 07:15
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Sorry but, I'm kind of new:
What code would I put if I wanted my program to wait for a specific key, rather than just "wait key"?

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Sixty Squares
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Posted: 12th Apr 2009 16:32 Edited at: 12th Apr 2009 16:32
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You would need to use a loop.

I would suggest a WHILE ENDWHILE loop. Those work like this: While the condition next to the word WHILE is met, everything inbetween WHILE and ENDWHILE keeps happening over and over again. When the condition is no longer met, the program leaves that loop and goes on the the next line of code. (That next line of code is the line after the ENDWHILE command)

To detect if the ENTER key is being pressed, for example, you would use the Returnkey() command. Returnkey() spits out a number one if you press enter, and a 0 if you are not.

So, to put the two together, you would come out with something like this. The REM command is just to make comments about the code and are not actual commands.



Without my comments:


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mike5424
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Posted: 12th Apr 2009 16:50 Edited at: 17th Apr 2009 14:25
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ifkeystate(14)=1
the brackets are for the key number 14 is W

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Sixty Squares
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Posted: 16th Apr 2009 02:34
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Quote: "the rackets are for the key number 14 is W"


No, 17 is W...

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RoyalBlood
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Posted: 16th Apr 2009 02:58
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^You're right...

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RoyalBlood
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Posted: 6th May 2009 02:16
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Sorry to bring this back up guys, but whi is my code snippet not working?



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Herakles
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Posted: 6th May 2009 02:31 Edited at: 6th May 2009 02:32
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You need an ENDIF command and you need to put a space between the IF and the KEYSTATE. You also don't need the THEN. For example:



You could also use the SCANCODE command:



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RoyalBlood
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Posted: 6th May 2009 02:41
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Oh, Thanks. I feel stupid for forgeting about endif...

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Herakles
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Posted: 6th May 2009 02:59
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Quote: "Oh, Thanks. I feel stupid for forgeting about endif"


It happens to everyone at some point or another.

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Kira Vakaan
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Posted: 6th May 2009 08:16
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Quote: "Oh, Thanks. I feel stupid for forgeting about endif..."


You shouldn't.



This should work just fine. Your issue was the space between if and keystate.
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Dream And Death
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Posted: 7th May 2009 00:40
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As Kira said.

There are two types of IF statement.

Type 1, the one liner:


or Type 2, the multiple liner:


There is also the ELSE command, which is useful in Type 2 IF statements, though unfortunately DarkBasic Pro is missing an ELSEIF command, so you end up with something structured like this:


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Herakles
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Posted: 7th May 2009 02:55 Edited at: 7th May 2009 03:01
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> Dream and Death

You could do else;if like this:



EDIT: I don't know why I typed all that out myself instead of just copying your code and changing what I had too to demonstrate what I was saying. I'm crazy.

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Dream And Death
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Posted: 8th May 2009 00:12
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Err, Herakles that is the same as my code - all you've done is changed the formatting!

A true ELSEIF would allow you to build a compound if statement without having multiple ENDIFs at the end. Our example here only has two, but when you start to nest five or six IF...ELSE...ENDIF statements, having five or six ENDIFs at the end is just silly!

At least with vb, for example, you can have:


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bobbel
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Posted: 8th May 2009 09:02
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yes, but that is what we have CASE SELECT for, it works just like an elseif... i think...

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Dream And Death
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Posted: 8th May 2009 21:07
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A SELECT statement only allows you to select a CASE based on the value of one variable - it doesn't deal with complex cases,

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Herakles
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Posted: 9th May 2009 03:27 Edited at: 9th May 2009 03:29
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Quote: "Err, Herakles that is the same as my code - all you've done is changed the formatting!"


I was just using it as an example of how you could use this thing: ";" to squish the ELSE and IF commands together to save a line. I just typed pretty much the same thing out myself (which was a stupid and unnecessary thing to do, I know) so it's in my personal coding format, but it should do the same thing as your code (which was intentional). "ELSEIF" isn't really necessary because you can just do IF statements within IF statements. Yeah, it'd be better to have ELSEIF 'cause you wouldn't need to waste as many lines with ENDIFs, but it's not a major loss for the language.

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