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DarkBASIC Professional Discussion / Random Crash 1.#QNANO?

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Mychal B
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Joined: 21st Jul 2010
Location: Coos bay, rainville
Posted: 18th Nov 2011 07:15
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I'm not sure what this could be the result of, but it's haunted me for a good while.

PROBLEM:
Once in a rare while when I do a heavy operation in my gameloop, or spread it out through a few loops, the frame rate severely drops, and about three seconds later the screen turns black.

EXTRA INFO: any coordinates is replaced by 1.#qnano. Someone once told me that it means not a number.

What I'm doing is activating a mob of ai, turning the excludeobject off on each of them, and begin calculating their path to the player. Any help would be greatly appreciated.

The fastfood zombie killer
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Quel
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Posted: 18th Nov 2011 10:05
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I don't really feel that something else could be said other than that you.. did something wrong...

Jumping across loops, and getting stuck in one of them with or without sync does similar things. Look at the code until you spot the problem, you can't really do more, maybe try to rem out each game parts and if the problem never occurs that way, then you're gonna know where is the problem.

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Mychal B
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Posted: 18th Nov 2011 21:47
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Alrighty, I just don't get it though. It only happens once in a while, making it really hard to try and track down.

The fastfood zombie killer
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Agent
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Joined: 7th Sep 2004
Location: Sydney, Australia
Posted: 18th Nov 2011 21:56
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You get results like this when you do something illegal like divide by zero or mismatch floats with other variable types. Sometimes it's really hard to track this type of bug because any operation involving a NAN (Not A Number) will result in a NAN, meaning the problem might not be the operation in which you're observing a NAN - it might have happened several calculations ago. You'll have to do a logic stepthrough of everything involved in the problematic operation and make sure everything is kosher.

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Cybermind
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Posted: 19th Nov 2011 00:17
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How about fiddling a little with the step-through, see if anything unusual is going on in your program.

The byte chrunchers are coming...
DIVIDING BY ZERO/BECAUSE WE SUCK...
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Mychal B
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Location: Coos bay, rainville
Posted: 19th Nov 2011 02:52
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For some reason I have never been able to get the step through mode to work for me Unfortunately I have to be back to work in just a min, and will be working again at 7 am, so I don't have time to check on this issue yet Thanks for the advice so far everyone!!!

The fastfood zombie killer
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Neuro Fuzzy
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Posted: 19th Nov 2011 05:08
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My advice: double check all your divisions, and make sure that it's impossible to divide by zero.

Besides that... what Quel said.

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BatVink
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Posted: 19th Nov 2011 17:08
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Also check you aren't using gotos in an unorthodox way (e.g goto out of subroutines)

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Mychal B
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Posted: 19th Nov 2011 21:17
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Nope, don't use goto

The fastfood zombie killer
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Diggsey
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Posted: 19th Nov 2011 23:29
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Are you using timer based movement? If so posting the code for that would help.

[b]
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Mychal B
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Posted: 20th Nov 2011 03:45
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I'll try to straighten it out before I put it up, just a sec....ironing...ironing...ironing....

In a nutshell...

ummm.... I may have just found it I'll repost after testing!!!

The fastfood zombie killer
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