jokiz » C# Trivia #6
ATTENTION: I've decided to put the upgrade on hold due to a compatibility issue of our server environment with the latest CS installer package. CS 2008 now requires SQL Server 2005 as the backend DB but our database server currenlty has SQL Server 2000 installed on it. I'll resume the upgrade once I figure out when Telligent is releasing a patch to the schema compatibility issue. For now, we will continue to use the old version of CS while waiting for the said patch. If you have any questions about this process, please don't hesitate to post them on our forums and I'll answer them as soon as I can. Thanks for your patience and support guys! I'll let you know as soon as this is resolved. - Keith Rull

C# Trivia #6

As I've mention in this post, I'll be continuing the trivia series here in my blog.  I've encountered a good one from internal chat yesterday, here it is:

will this compile?

[Test]

public void IntTests()

{

    int i = 1;

    if(i != null)

    {

        Debug.Write("jokiz");

    }

}

Posted Dec 06 2007, 01:43 PM by jokiz
Filed under: ,

Comments

bonskijr wrote re: C# Trivia #6
on 12-06-2007 1:20 AM

compile nman.. whats the trivia? always evaluate to true? heheh

Pieter Joost van de Sande wrote re: C# Trivia #6
on 12-06-2007 1:37 AM

Yes, and you'll get a compiler warning I geus.

Pieter Joost van de Sande wrote re: C# Trivia #6
on 12-06-2007 1:37 AM

Yes, and you'll get a compiler warning. It is strange, since it isn't a nullable type.

jokiz wrote re: C# Trivia #6
on 12-06-2007 8:06 AM

trivia is about int, value types and nulls, gets?

cruizer wrote re: C# Trivia #6
on 12-06-2007 10:39 AM

of course it won't compile! there's no "using NUnit.Framework" or "using MbUnit.Framework" at the top!

joke lang po, master... he he :D

Brendan wrote re: C# Trivia #6
on 12-06-2007 10:48 AM

Yes, it will build and Visual Studio will call you a moron (warning) because i can never be null. It is a value type not a reference type.

Add a ? after the word int and it will work.

jokiz wrote re: C# Trivia #6
on 12-06-2007 7:12 PM

sorry about that bossing, i'll post a complete class instead next time if you like, ;p.

Note that this method compiles fine with a warning in VS 2005, but not in VS 2003

jakelite wrote re: C# Trivia #6
on 12-10-2007 7:00 AM

i guess integers are autoboxed on conditionals as expected. whats interesting here is that the compiler optimizes away the condition on the if statement and replaces it with 1 != 0 with no jump statements in IL. and this happens even when the condition involves a function returning an integer. interesting discovery. thanks!

jokiz wrote re: C# Trivia #6
on 12-10-2007 8:25 AM

autoboxed in conditionals?  i have no idea actually about this. there is a blog post somewhere related to this and he basically says that int alias in c# is mapped to nullable int which i found to be bogus.

jakelite wrote re: C# Trivia #6
on 12-10-2007 8:22 PM

value types when assigned to a variable of type object are implicitly boxed. so the comparison between i and null now works because of this. there must be a bug in 1.x causing it to not compile. but since they can never be equal the compiler optimized it away. which is really amazing. compiler optimizations is always an interesting topic.

Genric name for ultram. wrote Ultram.
on 06-05-2008 6:09 AM

Ultram.

Propecia information from drugs com. wrote Comments on propecia.
on 07-27-2008 11:53 PM

Propecia contraindication in women.

Zolpidem online. wrote Zolpidem.
on 08-05-2008 10:33 PM

Zolpidem.

Work from home jobs. wrote Work from home mlm business opportunity.
on 11-02-2008 2:30 PM

Envelope stuffing work from home. Work at home. Work home time tracking software.

Add a Comment

(required)  
(optional)
(required)  
Remember Me?

Enter the numbers above:

Copyright DevPinoy 2005-2008