IBPS Clerks Results........

Yey, Finally IBPS released IT's CLERICAL Results......... PARTY TIME :)

Lets see how many parties can we get tonight :)

Click the below link to know your results......... All The Best :)

IBPS Clerks Results

                                                                                                                  

IBPS Specialist Officers Admit Cards

Enter your Reg No / Roll No / Password / Date of Birth to download your IBPS Specialist Officers Admit Card.

Click Here to Download

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The Phases of Compiler

Read the Basics HERE


There are several Phases in compilers are there. Those are

1. Lexical Analyser : Performs Lexical Analysis 
2. Syntax Analyser : Performs Syntax Analysis
3. Semantic Analyser : Performs Semantic Analysis
4. Intermediate Code Generator : Performs Intermediate Code Generation
5. Code Optimizer : Performs Code Optimization
6. Code Generator : Generates Target Code 

The Symbol Table is a Data Structure which is useful to store the identifiers in the program. 

The Error Handler is useful in Detecting and Reporting the errors. 

These two are useful from the starting to the ending of the conversion. ( I mean from the starting phase to the ending phase).  

NOTE : We can group these phases into two parts.. 

• Analysis : In which the compiler ANALYZES the given program. For this, the compiler SCANS and DIVIDES the program into parts. The first THREE phases comes under this category (shortcut : Check the names, if you can find the terms Analysis or Analiser, then that phase comes under the ANALYSIS category
• Synthesis : In which the compiler JOINS the parts of the divided program and makes the target program. (The last two phases comes under this category)

Now lets have a look at the functionalities of all these phases. 

Lexical Analysis : It is nothing but analyzing the LEXEMs (tokens), in this phase, the compiler scans the entire program and pics the tokens and groups them.

Syntax Analysis : Syntax is nothing but the structure. It is nothing but to Analyze the structure of the program (whether it is correct or not)

Semantic Analysis : In this the compiler checks the MEANING of the program.

(Note : The above two process will execute simultaniously, so in some books they combine these two names and call the process as Syntax and Semantic Analysis)

Intermediate Code Generation : After scanning the program, the compiler generates an intermediate code (which is neither High level code nor Low level code, which looks like the Microprocessor Code)

Note : Most of the compilers generates the TAC (Three Address Code) as the Intermediate Code. It contains, maximum 3 variable, so we call it as the Three Address Code. (note : we can convert any problem into this TAC form).

it just look like, Temp1 = Temp2 + Temp3  (temporary  variables) 

       or Temp2 = Id + Temp4     etc,

Code Optimization : It helps to improve the Intermediate Code. It make assure that the target code will run EFFICIENTLY in LESS TIME ( i mean, it should give the desired output in less amount of time)

Code Generation : It is the final phase. It generates the relocatable machine code or assembly code. It takes care about the target machine and where to store the variables in the target machine. Yea ofcourse, it takes care about the ORDER of the instruction execution too.

Thats all for now Friends.. Happy Reading.. 

                                                                                                              

Compilers Basics for IBPS IT Officers Exam

Assume that you visited china to meet China's Prime minister. The meeting was arranged in a big auditorium. But now the problem is, you don't know Chinese and he too don't know your Language (say Hindi). Then what  to Do? Now you have 3 solutions.

1. To learn Chinese
2. To make him learn your Language
3. Or you both should learn some other language (Like English) so that you can communicate in that language...

Now what if HE is not ready to learn your language or English??? and what if you too are Lazy enough to learn Chinese or English??? Isn't there any other solution for this problem???

There is......  If you have enough money, You can hire a person who knows your language as well as Chinese and he will work as a MEDIATOR for both of you people.. :)

Now come to our Subjects...... As we know, computer cant understand our Hais and hellos....

And we too cant understand Computer's 0's and 1's...  So how to talk to the computer and make it works according to your orders?

Can you teach English to computer? Its impossible, because its a machine. It cant understand anything except LOW VOLTAGE (0) and HIGH VOLTAGE (1)... On and Off in simple words...

We too are TALLENTED enough to use CTRL+C and CTRL+V so we are not ready to write big codes which looks like 00011 01001 110100 1001001 01001 11001 11111 0111010 101010 10101011 01111 1101010 11101 1010101  01010 n bla bla........

So what can we do now? we write a Software Code which acts as a TRANSLATOR and converts your instructions into 0's and 1's and gives them to computer and vice versa..  We call this SOFTWARE CODE as COMPILER.. Thats it :)

What exactly is the Compiler? is it a for Translating or for Debugging?

Lets go back to our Chinese Man, assume that you are communicating with him with the help of a Translator. And you have some problem with your TONGUE...  (assume)..... So, what will happn if you use  some adjectives like "Poker face and ######## (censored :P) " .

Now say, what if the Mediator translates that POKER FACE stuff as it is in Chinese???

Your relationship with the Chinese man, will collapsed and you will get some injuries if he is expert in those Chinese martial arts...

So, before going to translate your words in Chinese, your mediator (or Translator) warns you about the outcomes of your words (may be you will get kicked or killed, depends upon the intensity of your words :P) and confirms whether to translate them as they are or not...

Heare also same... Some programmer (like me) writes a program with so many errors. If the compiler translates as it is, the computer may collapse (as it cant hit you for your errors)... So the compiler warns you about your errors so that you can correct them and resubmit your program. So, the main task of the compiler is to TRANSLATE, in-order to translate an Error free program, it warns you about your errors :) 

The Technical Definition : So, technically you can say that "The compiler is a software program which converts the program written in High level language / Programming Language / User Language into the Machine Language / Binary Language to make an Executable Program. 

                                                                                                                           

The OSI Model - Study Materials for IBPS IT Officers Exam 2013

Once there was an Organization called International Standards Organization (ISO in short). It standardized the functions of the Communications System with abstraction layer and developed a Model. They named it as Open Systems Interconnection (OSI). ISO - OSI sounds funny, isn't it???

In this model, similar types of communication functions are grouped into Layers. There are 7 layers in this Model. Those are,

1. Physical Layer
2. Data link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer 

Each layer helps it's above layer to establish an error free communication, in other words, each layer depends on its below layer to establish an error free communication. 

How to remember these names????

Here the order is very important. If anybody asks you about these layers, you should start with Physical and end with Application Layer. You should not jumble these names according to your convenience. So you should remember these names with an order. Well, there are several techniques are there to remember these type of names. One of those technique is, making a funny name or sentence with the STARTING letters. Just, write the starting letters of these layers.

                                         P D N T S P A

Now make a funny sentence, here are some examples

• Please Do Not Touch Steve's Pet Alligator  

                       Or

• Please Do Not Throw Sausage Pizza Away 

Now I bet you never going to forget these names and order again :)

Ok, now lets have a look at the Functionalities of these Layers...

• Physical Layer : This is the First or Lowest layer of the OSI model. It takes care about the Physical Connections.
• Data Link Layer : This layer Encodes the data packets and provides error free node to node transmission. It is divided into two sub layers. Those are
• Media Access Control Layer (MAC Sublayer in short)
• It helps the computer to get the access of data transmission 
• Logical Link Control Layer (LLC Sublayer in short)
• It controls the order, flow and errors of the frames (Frame synchronization)
• Network Layer : This layer helps in Switching and Routing (connecting and transmitting), and also creates virtual circuits ( Imaginary paths for transmission)
• Transport Layer : This layer helps in providing Transparent data transmission. Its also checks whether the data completely transmitted or not.
• Session Layer : This layer is responsible for the Transmission Sessions. I mean Starting, Maintaining and Terminating the Communication. 
• Presentation Layer : This layer provides the data Independence ( simply you can remember that this layer is responsible for the data Presentation :) I mean, how you are presenting data (without any leakage)
• Application Layer : This is the topmost layer, this layer directly interacts with the end user. This layer is responsible for checking whether the claimed user is genuine or not. 

          Still having problems with these functions??? Have a look at the following diagram. It will be easier for you to understand :)

Very good. Now you know about the OSI model and It's Layers :) You know that it was developed by ISO.

Hey, you know one secret? ISO dint invent any new model. It just COPIED some old model and modified it.. Thats all.

Once there was a model called TCP/IP model (Transport Control Protocol / Internet Protocol) with this name itself, you can define its functionality :) It has lil complicated structure with only  4 Layers. Those are

1. Network Interface Layer
2. Internet Layer
3. Transport Layer
4. Application Layer

ISO Just elaborated this model and divided some of these layers into EXTRA LAYERS and developed OSI model. have a look at the following Diagram, so that you can understand the difference :)

Thats all for now friends. Happy reading...

Read the basics of Computer Networks HERE

IBPS bank it officer study material pdf download 2013

DBMS Study Material for IBPS IT Officers - Data Models

Read the basics HERE

Data Model means, to give a SHAPE to the data. A Data Model Makes it easier to understand the Data. We can define the data model as "The Collection of High-Level data description that hide many low level storage details". 

The Data Models are divided into THREE different groups. They are,

1. Object - Based Logical Models
2. Record - Based Logical Models
3. Physical Data Models

1. Object Based Logical Models :  These are used in describing data at Logical Level and View Level. ( Logical level describes what data are stored in the database and what relationships exists among those Data. This logical level is used by the DBA (Data Base Administrator). He must decide what information is to be kept in the Data Base. The View level describes Only part of the entire database to be viewed by the user of the database hiding the details of the Information Stored. 

The Object based logical models are described in the different following models.

• The E-R (Entity-Relationship ) Model
• The Object-Based Logical Model
• The Semantic Data Model
• The Functional Data Model

E-R Model : The entity is a "Thing" or " Object" in the real world that is distinguishable from other objects. The E-R model is based on the collection of basic objects called Entities and the Relationship among them. Consider the following Diagram.

In the above diagram, RECTANGLES represents ENTITIES, DIAMONDS represents RELATIONSHIP among those ENTITIES. LINES represents links of Entities to Relationships. 

Object - Oriented Model : The Object Oriented model based on a collection of OBJECTS. An object contains values stored in Instance Variables and Bodies of Code that operates on the Object. (These bodies of Code is called Methods).

Objects that contain the same types of values and the same methods are grouped together into classes. (A class is the definition of the object). 

Semantic Data Model : A Semantic data model is a more high level data model that makes it easier for a user to give Starting Description of the data in an organization. (Semantic is nothing but the Meaning). These models contain a wide verity of relations that helps to describe a real application scenario. A DBMS cannot support all these relations directly. So it is build only with few relations known as relational model in DBMS. A widely used semantic data model is the Entity-Relationship (ER) data model which allows us to graphically denote entities and relationship between them.

Functional Data Model : The functional data model makes it easier to define functions and call them where ever necessary to process data. 

2. Record - Based Logical Models : 

In this type of models, the data is kept in the form of RECORDS (documents). Thse models describes data at Logical and View Levels. When compared with Object Based Data Models, the record based logical models specifies the overall logical structure of the database and provides higher-level implementation. 

These are of 3 types. Those are,

• Relational Model
• Network Model
• Hierarchical Model

Relational Model : The relational model represents both Data (entities) and Relationships among that data in the form of Tables. Each table contains multiple columns and each column contains a unique name. Have a look at the following table. 

Network Model : Data in the network model are represented by collection of Records and Relationships among data are connected by LINKS. These links can be viewed as Pointers. Have a look at the following diagram.


Hierarchical Model : This is also same as Hierarchical model, the difference is the records in the database are represented in the form of TREES (in Hierarchical way)


3. Physical Data Models: Physical data models are used to describe data at the lowest level, which explains how the data is actually stored using complex low-level data structures. Actually, the physical data models are rarely used.

There are two types in Physical Data Models.

• Unifying Model
• Frame-Memory Model

Read about NORMAL FORMS Here....

Data Base Users and Administrator - IBPS IT Officers Special

Read Basics HERE

Depeending on their degree of expertise or the mode of their interactions with the DBMS, The Data Base users (people who uses database) can be classified into several groups. 

They are,

• Naive Users
• Online Users
• Application Users
• Sophisticated Users
• Specialized Users

Naive Users : Naive means Lacking Experience, these are the users who need not be aware of the presence of the Data Base System. Example of these type of users is The user of an ATM machine. Because these users only responds to the instructions displayed on the screen (enter your pin number, click here, enter the required money etc). Obviously operations performed by these users are very limited. 

Online Users : These are the users who may communicate with the Data Base directly via an online terminal or indirectly via a user interface and application program. These users are aware of the presence of the Data Base System and may have acquired a certain amount of expertise within the limited interaction they are permitted with a Data Base.

Application Programmers : Professional / Application programmers are those who are responsible for developing application programs or user interface. The application programs could be written in a general-purpose programming language or the commands available to manipulate a database. 

Sophisticated Users : Simply we can say that these are the EXPERIENCED users. These people interact with the system without writing programs. Instead they from their requests in a database query language. They submit each such query to a query processor, whose function is to break down DML (Data Manipulation Language, the language which is used to MAINTAIN the data. we shall discuss about this later) statements into instructions that the storage manager understands. Analysts who submit queries to explore data in the Data Base fall in this category. 

Specialized Users : These are the sophisticated users who write specialized database applications that do not fit into the traditional data-processing framework. Among these applications are computer - aided design systems, knowledge-based and expert systems, systems that store data with complex data types (Ex, Graphics Data and Audio Data) and environment-modeling systems.

DBA (Data Base Administrator) : The person who controls both Data and the Programs that access that data in the Data Base is called the Data Base Administrator (DBA).

Functions of the DBA are,

• Defining Schemas (arrangement of Data)
• Creating Storage Structure and Access Methods ( I mean how to store data and access that)
• Modifying the storage Data
• Granting Authorization Permissions
• Specifying the CONDITIONS of the data storage
• Periodically Updating the Data Base etc.,

Read about the Data Models HERE

Read complete study materials of IBPS IT Officers Here

The Transaction Management - IBPS Specialist Officers Study Materials

Read the basics of DBMS here

Asume that you want to transfer some money (Say Rs. 1500) to your friend's account....

You logged in into your bank's site and types your account number.

Later you typed your friend's name and his account number

Later types the amount and clicks on TRANSFER button.

Later???  Rs. 1500 /- TRANSFERS into your friend's account.

Now lets see this process in DBMS's point of view.

YOu entered some money (Rs 1500). The DBMS checks whether the mentioned money is available in your account or not.Assume that you have some 3000 in your account.

If available then it checks the reciepient's Account (Assume that he has Rs. 200 in his account)

Later the DBMS reduces your amount to Rs 1500 and Adds that 1500 to your friend's account.

And makes his account balance as Rs 1700 ( 200 + 1500).

Then shows you a message, something like "TRANSACTION COMPLETED"

yes, this is an example of Transaction.

A transaction is an execution of a user program and is seen by the DBMS as a series or list of actions. (or simply we can remember it as " A transaction is nothing but a List of Actions". These actions include the reading and writing of database.

ACID Properties (important) :

 These are the properties that a transaction should possess in order to avoid failures during concurrent access to a database. The ACID is an acronym which stands for Atomicity, Consistency, Isolation, Durability. Now lets have a look at these properties in detail. Ofcourse, for beginers these all may look same and confusing, read them two or three times. then you can get the exact meanings and differences among them...

• Atomicity : It ensures that the transaction either is executed completely or not at all. Incomplete transaction consequences are not entertained, check an example
• Assume that Shivani has Rs. 500/- in her account and Palvi has Rs. 200/- in her account. Now Shivani transfers an amount of Rs. 50/- to Palvi. A transaction debits the amount from shivani's account, but befrore it could be credited to palvi, if there is a failure, then transaction would stop. So finally Shivani loses Rs. 5o but palvi cant get the amount. This leaves the data in an inconsistent state. If there is a failure during transaction execution , then measures must be taken to get back the data in a form which was in, before transaction (I mean, the 50 shouldnt be deducted from Shivani's account in our case). This is taken care of by transaction management component.
• Consistency : The data in the database must always be in a consistent state. A transaction occurred on a Consistent data should end with the data with another Consistent stage after completion of that transaction. Take the above case, the total of the amounts of Shivani and Palvi are (500+200) is Rs 700/- So, after the Transaction completed, the total amount should be same. i.e., (450+250 = 700). Ofcourse, in intermediate stage, where the amount is deducted from Shivani's account but not yet credited to Palvi, the total would not be same. It is the responsibility of DBMS.
• Durability : Durability ensures that the data remains in a consistent state even after the FAILURE. (This is ensured by keeping copy of the old data in the Disk, till the transaction is COMPLETED). I mean, if shivani is transfering money to Palvi. The money is deducted frm Shivani's account and power gone (before adding the MONEY to palvi's account). Then our DBMS shouldn't save that transaction. This is called Durability.
• Isolation :  All transaction must run in Isolation from one another. I mean, each and every transaction should be kept unaware of other transactions and execute independently. The intermediate results shouldnt be available to other transactions. 

Click here to know about the Data Base Users and Administrator

Read Complete Set of Study Materials and Previous Papers of IBPS IT Officers Here

IBPS IT Officers Study Materials

Computer Networks (Basics) for IBPS IT Officers Exam 2013

Suppose you want to chat with your friend, or want to share your printer with your friend's system. Then you should connect your computer to his/her computer. In simple words, you are just forming a NETWORK by connecting two or more computers. These connections or arrangements are called Computer Networks.  These computers in the Computer Network may attached with cables, telephone lines, radio waves, satellites or infrared light beams.

Read More -->

Data Base Management Systems (Introduction)

Friends, in this post we shall discuss the basics of DBMS (Data Base Management Systems) which will be helpful for you for IBPS Specialist Officers Exam (IT Officers). 

Before going into details, lets have a look at the basic terminology of DBMS.

Data :  Data is the raw material from which Useful Information is derived. The word data is the Plural form of Datum (but nowadays, people commonly using data for both singular and plural). 

               Simply we can say that, data is a collection of unorganized  facts, but can be made organized into useful information.

Read More -->

The Keyboard

The KeyBoard 

There are various types of keys are there in Keyboard. 
Namely,

• Typewriter Keys
• FunctionKeys
• Enter Keys
• Windows Keys
• Number Keys / Numeric keys
• Application Keys
• Cursor Control Key

Have a look at the Below image to get a detailed View

Click on the image to get a Detailed View

☞ Back to the Computers Basics

Computers Basics

Once upon a time, there was a sooper hero named Khan Kapoor Kumar. He was very inteligent (He thinks so). Hez proud of his name. But unfortunately people dont call him with his name. They call him Politician instead.. As days passed by, our sooper hero came to know that the reason behind the villagers treating him like a Politician is because, he lacks of a small organ called BRAIN. So he made an Ironbox and gave some electricity to it. 

When he turned on the switch, it said YES, he marked it as 1

When he turned off the switch, it said NO, he marked it as 0

He became famous with this YES/NO Device. He added some circuits to it, so that it could perform some calculations. So he called it as Calculator. In-order to make his Ironbox remember calculations, he added some memory to it. And named it as Computer. 

He added some Input Devices (Keyboard, Mouse, Scanner, Touch pad, Light-pen, Joystick) to it so that he can talk to it.

He added some Output Devices (Monitor, Speaker, Printer) to it so that the Ironbox can talk to him. 

He felt happy because he developed a semi brain called Computer. So, he wanted to communicate with it.

He said "Hi"

It said "1011"

He said "How are you?"

It said "0110 1010 0101"

Then he realized that his Computer only can understand 1's and 0's. So he tried to talk in 1's and 0's language. Later he realized that its really hard to do that. So he attached a compiler to his Computer. The compiler converts his words into 1's and 0's and gives to the computer. And later converts the computer's response into our sooper hero's language. 

Our hero felt that he almost Did it. But even our Compiler also cant understand our sooper Hero's language. So he developed some languages (C, C++, Java etc) to talk to the compiler. 

So our sooper hero finally managed to build a Computer and Proved that hez a Brainless Brilliant. 

Hardware & Software
How does Computer Work ?
The Keyboard

How does Computer Work?

In this post we shall see some basic computer terminology which helps computer to work.

Input : Data / Information entered into the computer using various input devices. 

• Input Devices :
• Keybord : To type the data
• Mouse : To point and click the objects
• Tracker Ball : Works similar to mouse, used by Graphic Designers
• Scanners : Converts the Hardcopy into Softcopy (Simply scans paper documents and stores them in system)
• Touchpad : The desktop which responds according to the Touch. 
• Light pens : Used to point the areas on the screen.
• Joy Sticks : Used for Playing Videogames. 

                               

Input Devices

• Output : Data / Information given by the computer. It displays on Monitor (Screen) / Prints via Printer / Generates sounds via Sound boxes and ofcourse stores the information in Disks.
• Output Devices : 
• VDU : Video Display Unit. Also known as Monitor. Which displays output
• Printers : There are many types of printers. These are used for converting the Soft-copy into Hard-copy (Printing the data  on Paper)
• Plotter : It is also similar to printer, but it can draw continuous point-to-point lines directly from vector graphics files or commands. So you can expect more clarity than printers.
• Speakers : Gives the output in the Sound Signal form

                                        OutPut Devices

• Processing : The Processor/Central Processing Unit/CPU performs the operations with the help of ALU (Arithmetic Logic Unit - which performs Mathematical and Logical Operations)

• Storage : The Random Access Memory (RAM) or Memory temporarily stores your date while you are working with that. 
• Storage Devices :
• Hard Disk : Internal Drive of High capacity which stores larger and important files including your Operating System.
• The speed of the Hard disk is measured in milliseconds, 
• The capacity of the Hard Disk is measured in Giga Bytes (GB). You can get harddisks of 40-80GB now a days. 
• A Giga Byte is equalent to 1024 Mega Bytes (MB)
• Floppy Disk : Its helps you to store smaller amount of data and take 
• It's speed is Very Very low.
• Capacity normally 1.44 Mega Bytes (hardly you can store 6 or 7 wallpapers :P)
• CD/CD ROM : 
• Slower than Hard Disks and Faster than Floppy Disks
• Capacity 650+MB
• DVD : 
• Slower than HardDisks but faster than CDs
• Capacity upto 17Giga Bytes

                                 

                                Various Storage Devices

☞ Back to the Computers Basics



                                                                                                    

Hardware & Software

Hardware refers to the physical components of the computer. Monitor, Keybord, Cpu, The parts inside the CPU etc.

Computer Hardware

Software refers to the INSTRUCTIONS that makes the computer works. The software should be stored either in computer Hard disk, CD-ROM, Dvd or on a Floppy Disk and it should be loaded into the RAM (Random Access Memory) of the computer, when we needed.

                                      

Computer Softwares

☞ Back to the Computers Basics

List of News Papers

News Papers with website Links (Useful for Current Affairs)

Click on the News Paper name of your choice to Read Today's Updates

Ø  English Newspapers :

o   Times of India

o   The Hindu  

o   Hindustan Times  

o   Indian Express

o   India Today  

Ø    Important Links for Banking :

o    Business today 

o    The Economic Times  

o    Businessworld  

Ø  Sports :

o   Sports News  

o   ESPN                         

Ø   Assamese Newspaper

o   Asomiyapratidin

Ø  Bengali Newspapers

o   Aaj kaal

o   Ananda Bazar Patrika

o   Century Sangbad   

Ø     Gujarati Newspapers

o     Gujarat Samachar 

o     Sandesh 

Ø    Hindi Newspapers

o     Dainik Bhaskar  

o     Hindi Milap  

o     Dainik Jagran  

Ø    Kannada Newspapers

o     Kannada Prabha  

o     Prajavani 

o     Sanjevani  

Ø    Konkani Newspapers

o     Vauraddeancho (Typed in English)  

Ø    Malayalam Newspapers

o    Malayala Manorama  

o    Mathrubhumi Daily 

o    Kerala Kaumudi  

Ø    Marathi Newspapers

o     Pudhari 

o     Maharashtra Times 

o     Lokmat 

Ø  Oriya Newspapers

o    Dharitri 

o    Sambad  

o    The Oriya Samaja 

Ø    Punjabi Newspapers

o     Daily Ajit  

o     Punjab Express  

o     Sanjh Savera  

Ø  Tamil Newspapers

o   Dinakaran  

o   Daily Thanthi  

Ø    Telugu Newspapers

o     Eenadu  

o     Saakshi  

Ø    Urdu Newspapers

o     Inquilab 

o     Munsif Daily  

o     Urdu Times