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DarkBASIC Discussion / The max number that DarkBASIC recognises before errorring out.

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Miketheman123
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Posted: 17th Dec 2006 01:56
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I don't know if its just my computer or what not but DarkBASIC on my comp seems to error and glitch if presented with extremely big numbers. The max value that I think I can use without problems is 999,999,999. Anything above that brings back different, lower, higher or negative numbers. Any reasons for this or is 999999999 the biggest number DarkBASIC can recognise fully functionally.

Mike
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TDK
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Posted: 17th Dec 2006 02:55
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Integers in DBC are signed 32bit (1 bit is used for the sign) which gives them the range -2147483647 to 2147483647. (DBP has larger variable types).

Basically, if you use values greater than 2147483647 then you end up with a negative number.

For example, if you try the following snippet:

A = 2147483648
Print A
Wait Key

all 32 bits are used (the sign bit is tripped) and you get a negative number.

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NA170425
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Posted: 17th Dec 2006 04:04
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That's happening because variables don't have enough memory to hold very large numbers. Take this dword for example:

11111111 11111111 11111111 11111110

When you increment it, it becomes this:

11111111 11111111 11111111 11111111

Now it is compeletly full, if you increment it again, it will become this:

1 00000000 00000000 00000000 00000000

However, that extra bit is simply tossed out, and the dword is interpred like this:

00000000 00000000 00000000 00000000

Which is 0 in decimal.

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Kyhoshi
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Posted: 22nd Dec 2006 03:56
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what happens if a object manages to get to that point in 3d space?

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NA170425
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Posted: 22nd Dec 2006 21:05
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You'll never need to worry about that, I'm sure no 3d world is that big.

I tried doing that once just to see what happened. 3d objects store their positions as floats, and since floats can hold numbers like undefined and infinity, weird stuff happens. My text statements told me the object was positioned at (infinity, infinity, infinity) and I was stuck there no matter how fast I tried to move away.

infinity + 100000 = infinity

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