Android Question Initial state of variables

[Paulo Rosa]

Hi,

Just a small doubt I couldn't find the answer for in B4X documentation:

In VB 6 variables are always initialized when they are declared. For instance, if I declare "Public myflag as boolean", I can be sure that myflag variable will have the initial state of false... and so on for the other types of variables (zero for numeric types, empty string for strings, etc.).

Do B4A, B4J, etc. have the same behaviour? Can I always assume that variables are initialized with their default values, at the moment they are declared?

Regards,

 

[LucaMs]

This is because Items is an array, not a simple variable of "simple" type.

 

[Cableguy]

This is because Items is an array, not a simple variable of "simple" type.

No, it's because items is a field of a type and the Type object must be initialized

 

[Cableguy]

And stop making me hungry!

 

[LucaMs]

No, it's because items is a field of a type and the Type object must be initialized

Try this:

' Process_Globals
Type MyType (Name As String, Item As Int)


Sub SomeRoutine

   Dim a As MyType
   a.Name = "even more angry"
   a.Item = 2
 
   Log(a.Name & TAB & a.Item)

 

[MarkusR]

@LucasMs
#24 that i meant there is a.IsInitialized=False but it can be used.
before i had this idea for you

Type MyInt(Value As Int)

and thought it raised an error

 

[LucaMs]

And stop making me hungry!

Well, now I'm really hungry

 

[Cableguy]

Try this:

' Process_Globals
Type MyType (Name As String, Item As Int)


Sub SomeRoutine

   Dim a As MyType
   a.Name = "even more angry"
   a.Item = 2
 
   Log(a.Name & TAB & a.Item)

Just because it works and raised no errors does not mean it's the correct way to do it!

 

[LucaMs]

Just because it works and raised no errors does not mean it's the correct way to do it!

In fact, absolutely not, it is much better to always initialize, even the normal variables for which it is not necessary; just what I mean.

 

[MarkusR]

@LucasMs
have a solution how about :
DimNotInitialized a as mytype
DimNotInitialized b as int

 

[LucaMs]

@LucasMs
have a solution how about :
DimNotInitialized a as mytype
DimNotInitialized b as int

Is it a suggetion for Erel?

 

[MarkusR]

@LucasMs
he will say no and maybe a compiler option DoNotInitialize is better.

 

[LucaMs]

a compiler option DoNotInitialize is better.

 

[LucaMs]

a compiler option DoNotInitialize is better.

Unfortunately I fear it is impossible.

 

[Cableguy]

The rolling stones were right...
You can't always get what you want!

 

[LucaMs]

The rolling stones were right...
You can't always get what you want!

Ok, but I do not pretend so much; just to be 30 again, 30 billion euros and Ornella Muti 20 years old, that's all, nothing more.