My Tech notes: October 2009

Unix Documentation

Free Online Unix Training Materials

Lists many links to free Unix training materials.

Pointers and Arrays Materials

Pointers and Arrays materials Explained for C beginners

C FAQ and General Questions C Interview Questions

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Saturday, October 24, 2009

Dotnet, .Net 3.5, 2.0, C# Interview Questions

Few questions on dotnet, C# 2.0, 3.5
On Object oriented concepts

1)What is inheritance with e.g
2)What is polymorphism
-function overloading
-Function overriding
-virtual keyword use
-Static keyword and use
-Abstract classes

3)What is threading and how do we use in realtime application(cognizant)
4)What is threadpooling, lock, monitor(write code sample)
5)Architecture of current project
6)Session state, diffrent types of state management.
7)What is Application_Start, how it works.
8)Type of authentication in
9)How to configure ASP.NET application.
10) What is Impersonation.
11) What is WebService, WSDL, UDDI, Discovery, asmx files.
12) How to implement WebService and use it.
13) When to use WebServices.
14) WPF, how to implement(BOA)
15) Testing concvepts.
16) Test attributes
17) Flow of Automation Test Method execution
18) Features of dotnet 3.5
19) CLR, garbage collection
20) Finally block
21) Manifest, Metadata, MSIL
22) Assemblies, Type of assemblies, strong name
23) GAC, gacutil, shared assemblies, path of GAC
24) Extended properties, propertyInfo
25) Better choice between WinForm and WPF
26) XAML, primitive
27) C# 3.0 features

Many are their will keep updating

Answers will be provided as per the need. Please feel free to query.

Tags: OOP, C#, framewrok, Dotnet, .Net, 2.0, 3.0, 3.5

Thursday, October 22, 2009

Virtual Table *_vptr , VTBL, C++

VTBL or VPTR nothing but virtual table and virtual pointer in C++.

It gets created when we create function with virtual keyword. As soon as we create the virtual function in a class A table gets created behind the code.

virtual void function1(){...}

ChildClass : public BaseClass
virtual void function1(){...}// method overridden.

When we override method that is create another version of function in derived class ChildClass in above case then the *_vptrvirtual void function1(){...}// method overridden. gets created for BaseClass.

So VTBL Of Base Class has entry for function1 and Child class will be pointing to that function. *_vptr is nothing but the pointer to function.

Note: ones the virtual keyword is introduced all the upcoming functions are considered as virtual.

ChildClass: public BaseClass
virtual void function1(){...}// method overridden.
void function2(){}

In above case function2 also considered as virtual.

BaseClass will not be pointing to any of Child Class functions and ChildClass will be pointing to all the virtual functions whose entry is in VTBL of baseclass as soon as the object of the base class instantiated or the method is overridden.

Tags : pointer, virtual, C++, function pointer,VTBL, VPTR, Function overriding , polymorphism