Anwer Of Question : Difference between PDA and Tuning Machine

1. PDA has a capability to move in a on direction (right) while tuning machine has a capability to move either left or right direction.
2. PDA contain a stack which stating symbol is represented by # where TU contain a unlimited buffer.

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Answer of Question : How to call a default constructor inside a default constructor

in below example , we make an object of A using the Constructor of B Class.
First default constructor of class A called then CLR call default constructor of class B ,then make the object of class A .

public class A


{ public A()

{  Console.WriteLine("A"); }

}

public class B:A

{ public B()

{ Console.WriteLine("B"); }

}

class Program

{ static void Main(string[] args)

{

 A ob = new B();

}

}

output
A
B


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Answer of Question : deadlock, starvation and synchronization problems in multithreaded scenario

Thread is a sub part of a process . Multiple Thread Model involve the existence of multiple threads. Three are main problem in multiple thread model.

1. Deadlock :- Suppose there are two thread T1 & T2 of a process P and R1 & R2 are two resouces . T1 has R1 and T2 has R2 at intance of time . suppose T1 need a resource R2 that are acquired by the T2 and T2 need a resource R1 that are acquired by the T1 then these type of situation goes in unlimited waiting i.e. these situation called Deadlock Problem.
2. Stravation :- Suppose thread are processed on the base of Priority (More Priority Processed First),T1 & T2 are two thread .T1 has more priority than T2 than T1 first processed and suppose in mean time another thread T3 come with high priority than T2 , T3 processed before than T2. and so on then t2 has wait for limited of a time while thread has a capability to perform work.This type of situation is called stravation.
3. Synchronization :-The biggest problem of allowing multiple threads sharing the same data set is that one operation in one thread could collide with another operation in another threads on the same data. When this happens, the result is un-desirable.

          Let's use a bank application program as an example. Assuming that the program has multiple threads   running, with each thread connecting one ATM system, and you have a saving account in the bank with $100.00, now you and your friend are going to two different ATMs at about the same time, and trying to withdraw $50.00 from your account, what do you think it will happen?
If the threads are running independently, the following could happen:

Time     01:01      02:01     03:01     04:01
         +----------+---------+---------+-------
Thread 1            Get       Set
Action   You        Account   Account   You
         Withdraw   Balance   Balance   Receive
         $50.00     $100.00   $50.00    $50.00

Time      01:02      02:02     03:02     04:02
         -+----------+---------+---------+------
Thread 2             Get       Set
Action    Friend     Account   Account   Friend
          Withdraw   Balance   Balance   Receive
          $50.00     $100.00   $50.00    $50.00

Time     01:01      02:01     03:01     04:01
         -----------++--------++--------++------ 
Account  $100.00    $100.00   $50.00    $50.00

Both you and your friend will receive $50.00 each, and your account will still have $50.00. The bank could lose $50.00. The solution to this problem is synchronization.


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Algorithmic Trading Technology

Yesterday, I contact to Mr.RK Dhanvada (Business & Recruitment Consultant, D & HR Consultants ,Hyderabad ) and talked him about 10 min and told him that I am B.Tech(C.S) final year Student of Shobhit University, Meerut .I passed OCA and MCTS exam . I looked for an Job. He send me his email id and asked for sending the email with resume and certification.


I send an email to him.In response, I got 10 question of Algorithmic  Trading Technology ,which i want to share you.





1. Explain mechanism and pointers related to virtual functions in C++.

2. How to call a default constructor inside a default constructor?

3. What is Object-Factory design pattern?

4. What is the runtime complexity of STL Set and Map?

5. Implement a red-black tree in C++.

6. Simulate Travelling-Salesman problem in C++.

7. What happens when we cast a huge pointer into a far pointer in C?

8. Explain deadlock, starvation and synchronization problems in multithreaded scenario.

9. Explain complete booting process in a Microsoft® Windows based PC.

10. Differences in PDA and Turing machine.


the answer of these question , are posted now.



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