Success with Random Questions, but....

[william24]

I have successfully created a simple quiz that takes questions/answers from a text file with no problems. I have played around with adding a randomization feature so that the questions are given randomly. I have finally succeeded in doing that, however, I have noticed that at some point in the quiz, the app closes. It appears to close at different points in the quiz (sometimes after the third question, sometimes after the ninth question....never after the same question). Again, I did not have this problem until I added arc4random.

Any ideas of what might be causing this and where I should look to fix this? I am very excited in what I have completed, but this setback is throwing me off.

Thanks in advance!

[LittleX1]

I guess memory problems. What does the console say? Any errors?

If you're sure, that the randomization part is responsible for the problem, you could post some of your code.

[baja_yu]

Regarding possible memory leak, did you check if your app is receiving the memory warning (didReceiveMemoryWarning)?

Also, did you run Instruments to check if you have a memory leak.

[william24]

Originally Posted by baja_yu

Regarding possible memory leak, did you check if your app is receiving the memory warning (didReceiveMemoryWarning)?

Also, did you run Instruments to check if you have a memory leak.

This will show how new I am to all of this, but I was unaware of running Instruments to check for a memory leak. I did run it....app stopped...but did not seem to indicate a memory leak (although I may not be looking in the correct part). Anything else I should check?

[william24]

Originally Posted by LittleX1

I guess memory problems. What does the console say? Any errors?

If you're sure, that the randomization part is responsible for the problem, you could post some of your code.

I'm not sure if it is directly responsible...I just know that the problem didn't occur until I added that code. I may post later after I look at a few other items.

[LittleX1]

Originally Posted by william24

This will show how new I am to all of this, but I was unaware of running Instruments to check for a memory leak. I did run it....app stopped...but did not seem to indicate a memory leak (although I may not be looking in the correct part). Anything else I should check?

You might also check your randomization code again.. Maybe based on the random code, you're trying to access an object which doesn't exist.

[baja_yu]

Check these two texts out Loading… and Loading…

Check out the other documents too. Apple really has excellent documentation, brilliantly written and easy to read, with lots of sample code. And keep in mind I'm not that big of a fan of Apple
I actually read about 3000 pages of it before starting on "hello world", and there's lots more to go through

[william24]

Originally Posted by LittleX1

You might also check your randomization code again.. Maybe based on the random code, you're trying to access an object which doesn't exist.

I have discovered that it is a NSRange Exception....index is beyond bounds. I can only assume that it was my code and that what was generated was beyond what I had in the text file (?).

The following is what I have. It probably isn't pretty, but I am just trying to work on small things and learn.

int i;
int j;

i = 15; i > 0;

j = arc4random() % i;
questionNumber = (j + 1);


NSInteger row = 0;
if (questionNumber < 1);
{
row = 0;
}

if(questionNumber == 1);
{
row = questionNumber - 1;
}

if(questionNumber > 1);
{
row = ((questionNumber - 1) * 6);
}

Again, it probably isn't pretty, but I did finally get something to work...if only for a little while. Any ideas on how to make this work? I appreciate the help.