Interview Questions (in C#) [closed]

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So I was given a small program to write, which I did开发者_开发问答 well but then I was asked the following and I was a bit confused.

What are the values of the following?

// I told them that they would get an error as they are not initialized, so they are pointing to some address in memory...

int a;
Object b;
int d = a;
bool c; 

if in Java, replace the last line with

boolean c;

Please let me know the correct answer to this as I am sure it will be brought up again. Thank you :)

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The .Net CLR initializes all fields and locals to their default values.
In your case, that's 0, null, and false.

However, this code will not compile under any circumstances.

Inside a method, C# will not allow you to use uninitialized locals, so d = b will not compile.
As instance fields, C# does not allow you to use this until you're inside the constructor, so d = a will not compile in a field initializer.

As static fields, this would compile, but the static keyword is missing.

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In Java, all of this is also true, except that Java does allow you to use this in field initializers.
Therefore, this code is valid in Java as instance fields.

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In C# the default value for an int is 0. An Object is null. And a bool is false.

A simple google found the asnwer.

http://msdn.microsoft.com/en-us/library/83fhsxwc(v=vs.80).aspx

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a == 0, b == null, d == 0, c == false