Why are class variables required to be initialized?

Why would you declare a variable before the value you want it to hold
is known? Can you give an example?

2009/8/2 florin.g :
>
> If scala is about productivity and conciseness, why wouldn't scala initialize
> variables to their default values as it does in many other situations? Sure
> you say, in order to infer type yet why not choose to enforce type
> declaration val x: Int; rather than val x = 1; when variables are not
> initialized?
>
> --
> View this message in context: http://www.nabble.com/Why-are-class-variables-required-to-be-initialized...
> Sent from the Scala - User mailing list archive at Nabble.com.
>
>

Is this what you look for?

scala> var x : Int = _
x: Int = 0

scala> var x : Any = _
x: Any = null

florin.g wrote:
>
> If scala is about productivity and conciseness, why wouldn't scala
> initialize variables to their default values as it does in many other
> situations? Sure you say, in order to infer type yet why not choose to
> enforce type declaration val x: Int; rather than val x = 1; when variables
> are not initialized?
>
>

-----
My scala solutions for http://projecteuler.net/ Project Euler problems:
http://eastsun.javaeye.com/category/34059 Click here

Thanks Eastsun,

I did not mean to be offensive. I've started looking into scala in weekends
and I love its brevity.

Florin

Eastsun wrote:
>
> Is this what you look for?
>
> scala> var x : Int = _
> x: Int = 0
>
> scala> var x : Any = _
> x: Any = null
>
>
> florin.g wrote:
>>
>> If scala is about productivity and conciseness, why wouldn't scala
>> initialize variables to their default values as it does in many other
>> situations? Sure you say, in order to infer type yet why not choose to
>> enforce type declaration val x: Int; rather than val x = 1; when
>> variables are not initialized?
>>
>>
>
>

Ricky,

You're right. I meant 'var' not 'val'.

Thanks.

Ricky Clarkson wrote:
>
> Why would you declare a variable before the value you want it to hold
> is known? Can you give an example?
>
> 2009/8/2 florin.g :
>>
>> If scala is about productivity and conciseness, why wouldn't scala
>> initialize
>> variables to their default values as it does in many other situations?
>> Sure
>> you say, in order to infer type yet why not choose to enforce type
>> declaration val x: Int; rather than val x = 1; when variables are not
>> initialized?
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Why-are-class-variables-required-to-be-initialized...
>> Sent from the Scala - User mailing list archive at Nabble.com.
>>
>>
>
>
>