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DarkBASIC Professional Discussion / Variables not working

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super nintendo man
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Posted: 22nd Feb 2011 01:50
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At the top of the code for a game I’m making, I’m setting variables like so…

dim gravity(1000)
collbox#=2
playobj#=1
radius#=0
movement#=.5

all looks good so I try to use the variable collbox# in a function.

cd#=intersect object(collbox#,cx#,cy#,cz#,ca#,cy#,cb#)

When I run the game, it exits out and tells me “Object Number illegal.” So I use Print to see the variable and it says 0.

So what I can’t figure out is why it returns 0 when I set it to 2. Please Help
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Grog Grueslayer
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Posted: 22nd Feb 2011 05:35 Edited at: 22nd Feb 2011 05:36
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To get variables working within functions you need to set them as GLOBAL otherwise they always start as zero within a function. Arrays are automatically GLOBAL by default.



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Stab in the Dark software
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Posted: 22nd Feb 2011 16:24
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When you use the # symbol at the end if your variable, you are declaring it as a float. Your object number should never be a float. A better way would be




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Custom,intel 3.0GHz Hyper Threaded,4GB RAM,ATI X1500 256mb,
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super nintendo man
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Posted: 23rd Feb 2011 03:58
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The global thing actually set off red flags in the compiler.

I tool a closer look at my code and I found the problem. The code calling the variable was inside a custom function since I was testing them out. All I did was replace the function command with a gosub and it worked perfectly.

Also, I have one last question for Mod’s. I’ve been a new member here for roughly 1½ years. How many more posts do I need to be a regular member?
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Grog Grueslayer
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Posted: 23rd Feb 2011 22:44 Edited at: 23rd Feb 2011 22:45
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Setting a variable to GLOBAL shouldn't cause any errors. Oh, it's probably because I left the defining values on them... sometimes it works ok sometimes not.

Try this instead:


They generally don't take people out of post approval if you just read messages. Just post normally and eventually you'll get out of the newbie slap. I was out of the newbie slap within a day after I started posting.

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IanM
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Posted: 23rd Feb 2011 23:17 Edited at: 23rd Feb 2011 23:17
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IIRC, I believe you simply have to assign the correct type of value to avoid the errors:


[edit]Doh! Forgot to add the 'global' keyword

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Grog Grueslayer
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Posted: 24th Feb 2011 00:49
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Thanks IanM.

There you go Super Nintendo Man... put those routines back into functions and it'll work the way IanM said.

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TheComet
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Posted: 24th Feb 2011 12:33
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Aren't objects only words? Why make them integers? You can save 2 whole bytes:



I suppose you will all now say "doh comet, 2 bytes isn't going to make a difference", and prove me wrong, but I say it DOES make a difference. Of course it's only going to be a few nanoseconds, but if you have a game like mine with 500+ variables, it quickly adds up to be a few microseconds slower. This may sound silly, but I prefer to be as efficient as possible in EVERY aspect, even if it only saves me a few microseconds. Why waste processing power when you don't have to?

TheComet

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IanM
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Posted: 24th Feb 2011 14:02
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It doesn't make a difference here - DBPro still allocates 4 bytes for each variable, and your x86 processor will access 32 bits at a time.

It MIGHT make a difference if the values were being used in calculations, but I suspect that you lose that in the conversions that DBPro carries out behind the scenes. That's if you can measure the difference in the first place.

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TheComet
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Posted: 24th Feb 2011 16:35
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I suspected as much...

My critical thinking on this theme comes from programming microcontrollers, as their resources are very limited.

TheComet

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