Android Question Dim Array

Giusy · Oct 4, 2018

Hi
I just have to size an array

B4X:

Sub Globals
   Dim NOME(12) As String
End Sub

Sub Activity_Create(FirstTime As Boolean)
   
    NOME(1)="DSDSD"
    NOME(2)="DSDSD"
    NOME(3)="DSDSD"
    NOME(4)="DSDSD"
    NOME(5)="DSDSD"
    NOME(6)="DSDSD"
    NOME(7)="DSDSD"
    NOME(8)="DSDSD"
    NOME(9)="DSDSD"
    NOME(10)="DSDSD"
    NOME(11)="DSDSD"
    NOME(12)="DSDSD"
End Sub

and I have this error:
Error occurred on line 42 (Main)
java.lang.ArrayIndexOutOfBoundsException: length=12; index=12

Why?

DonManfred · Oct 4, 2018

1. ITem is 0 (ZERO)
Last item of a 12 item array is, for sure, 11

Star-Dust · Oct 4, 2018

B4X:

Sub Globals
   Dim NOME(12) As String
End Sub

Sub Activity_Create(FirstTime As Boolean)
    NOME(0)="DSDSD"
    NOME(1)="DSDSD"
    NOME(2)="DSDSD"
    NOME(3)="DSDSD"
    NOME(4)="DSDSD"
    NOME(5)="DSDSD"
    NOME(6)="DSDSD"
    NOME(7)="DSDSD"
    NOME(8)="DSDSD"
    NOME(9)="DSDSD"
    NOME(10)="DSDSD"
    NOME(11)="DSDSD"
End Sub

Giusy · Oct 4, 2018

Even starting with zero and ending with 11 I have the same error

DonManfred · Oct 4, 2018

Giusy said:
Even starting with zero and ending with 11 I have the same error

because you are tying to get index 12. 11 is maximum. This is the error you got.

Giusy · Oct 4, 2018

This is the program

Giusy · Oct 4, 2018

@DonManfred
True! I can not believe it, maximum 11?

DonManfred · Oct 4, 2018

All Lists, Arrays in B4X does start with index 0.

B4X:

Dim NOME(12) As String

Results in Index 0 to 11!

KMatle · Oct 4, 2018

Giusy said:
True! I can not believe it, maximum 11?

It's a Java thing. First one is ZERO, not 1.

It's like: In the year 0 the first century began, so 1869 was in the 19th century and we now live in the 21st though it's 2018

Another one: When you measure a wall for wallpapers your meter starts at 0 cm (or inches). The first cm starts at 0. I've never seen one starting at 1

Giusy · Oct 4, 2018

Thanks for the explanation @KMatle

DonManfred · Oct 5, 2018

Giusy said:
True! I can not believe it, maximum 11?

I strongly suggest to watch the Colletions Video (and probably you should watch all others too!)

ilan · Oct 5, 2018

KMatle said:
It's a Java thing. First one is ZERO, not 1.

really? i thought in all languages an array starts to count from 0.

DonManfred · Oct 5, 2018

ilan said:
really? i thought in all languages an array starts to count from 0.

Comparison of programming languages (array)

klaus · Oct 5, 2018

In Visual Basic you could set it to 1 with the Option Base 1 statement.

Giusy · Oct 5, 2018

Yes @klaus,
and I arrive from Visual Basic

Peter Simpson · Oct 5, 2018

@Giusy did you finally get it working as expecred?

B4X:

'Simple array example
    Dim Count(12) As Int
 
    For i = 0 To 11
        Count(i) = i + 1
        Log($"Count(${i}) = ${Count(i)}"$)
    Next

RB Smissaert · Oct 5, 2018

klaus said:
In Visual Basic you could set it to 1 with the Option Base 1 statement.

In VB6 and VBA you can do this:

Sub test()
Dim arrInt(-10 To 10) As Integer
arrInt(-10) = 100
MsgBox arrInt(-10), , "value of array element -10"
End Sub

RBS

DonManfred · Oct 5, 2018

RB Smissaert said:
In VB6 and VBA you can do this

how does this help in b4x/this thread? How is it related to the question asked about B4A?

RB Smissaert · Oct 5, 2018

DonManfred said:
how does this help in b4x/this thread? How is it related to the question asked about B4A?

Not much, I just replied to the post of Klaus.

RBS

raphael75 · Oct 7, 2018

KMatle said:
It's like: In the year 0 the first century began, so 1869 was in the 19th century and we now live in the 21st though it's 2018

Actually there is no year 0
The first century goes from year 1 to year 100.
The 21st century goes from 2001 to 2100.
https://en.wikipedia.org/wiki/Century

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