What is stored in a variable that has null value?

[sheila11]

Hi all,

C# now has nullables.

If I have declared a nullable variable, and its value is null, then what is stored in it?

int? x;

I was asked this question in an interview, and I am puzzled.

TIA,
Sheila

 

[jmeckley]

I wouldn't say c# 'now' has nullables, they have been there since 2.0 (2004/2005)

[tt]int?[/tt] is shorthand for [tt]Nullable<int>[/tt] so I would say the value is a nullable object of type int. for all practical purposes there are 3 possible values:
the default (0)
a non-default (not 0)
null

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190
faq732-7259

 

[PRPhx]

Here is an explaniation of the nullable types frommicrosoft:

http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx.

 

[BobRodes]

To answer the OP's question: I'd say null. The HasValue property will be false if the value is null, but there's still a memory location with a value stored in it, and the value is null.

 

[BobRodes]

Oo,that came out kinda wrong. I didn't mean to suggest that nobody else answered the question!