Bug(?): Dim array

nfordbscndrd · Jan 31, 2011

In Global:

Dim Cards(52) As Int

In Activity_Create:

Cards(52) = someNumber

Error when app is compiled-run:

java.lang.ArrayIndexOutOf BoundsException

How can 52 be an out-of-bounds index when I Dimmed it to 52?

TOB · Feb 1, 2011

0 to 51 = 52?

stevel05 · Feb 1, 2011

As TOB suggested when you dimension an array of size 52, it actually has 52 elements. It's just that the first one is element 0. So 0 to 51 = 52 elements.

Steve

nfordbscndrd · Feb 1, 2011

stevel05 said:
As TOB suggested when you dimension an array of size 52, it actually has 52 elements. It's just that the first one is element 0. So 0 to 51 = 52 elements.

In any version of BASIC I've ever used, 52 is the last index number, not the number of elements, so Dim A(52) is 0-52 in other BASICs. In fact, I am in the process of converting a Visual Basic program and its got a ton of arrays dimensioned, all to the last index number.

Anyway, it just means that I'll have to change all those Dim's by upping their values by one.

TOB · Feb 3, 2011

Well, in almost any other languages an array is zero-based and the dimension indicates number of elements not he last one. I'm also using PowerBasic for Windows and it's just the same thing there. See this Java info: Arrays (The Java™ Tutorials > Learning the Java Language > Language Basics)

nfordbscndrd · Feb 3, 2011

TOB said:
Well, in almost any other languages an array is zero-based and the dimension indicates number of elements not he last one. I'm also using PowerBasic for Windows and it's just the same thing there.

Well, I guess that on the B4A home page, they should change "Basic4android language is similar to Visual Basic" to "...PowerBasic". <grin> It seems like 99% of B4A's syntax and way of doing things is different from VB.

agraham · Feb 3, 2011

nfordbscndrd said:
B4A's syntax and way of doing things is different from VB.

It may be different to VB6 but it is similar in many ways (including array declarations!) to VB.NET which has been around for nine years now.

nfordbscndrd · Feb 3, 2011

agraham said:
It may be different to VB6 but it is similar in many ways (including array declarations!) to VB.NET which has been around for nine years now.

VB.NET hardly qualifies as the same language as the original Visual Basic 1-6, which is why a huge number of VB6 programmers (including me) never made the change. Maybe the B4A home page should change from "similar to Visual Basic" to "similar to VB.NET" (seriously).

Bug(?): Dim array

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