Help needed with simple program

[Nelitzeb]

I need to write a simple program and when I try to run it, there's an error. Here's a screenshot:

[KevinWorkman]

Instead of simply posting a screenshot, if you want help, you're going to want to provide an SSCCE that demonstrates the problem, and you're going to want to copy and paste the full, exact text of the error message here. I'm not trying to be mean, but I can't really see the text in that image (I refuse to admit that I need glasses). Make it easier for people to help you.

But here's a hint- What is the length of the array? What indexes does that mean it has? What index are you trying to access?

[ozzyman]

ArrayIndexOutOfBounds error means that you tried to pass an index into an array which doesn't exist.

For example, if I asked the program to give me the value for myArray[5] (index #5) but the array has only 4 items, when the program passes 5 into the array you will get this ArrayIndexOutOfBounds error.

I can see that you are using a loop where the index is set to go through <= nL or nA; I havent tested your code but my first assumption would be that you should take out the "less than or equal to" and change it to "less than" so that the array index doesnt go out of bounds.

EDIT: on second thoughts, you seem to be initializing a 2D array with [M][N] spaces... when you loop, make sure that you are looping LESS THAN those two values (M and N).

[Nelitzeb]

I figured out the problem. My Math.random generated numbers from 0 to 16. I forgot that the indexes in an array with 16 elements go from 0 to 15, so my Math.random would eventually generate 16 and I got an error. :)

Thanks for the help, I really appreciate it.