Android is a kind of operating system that based on Linux operating system which is designed for the touchscreen mobiles, tablet computers and Smartphone. This is found in 2007 by the Android Inc. Android is now one of the most popular operating system and millions of people use Android Smartphone. There are lots of users of android version in Bangladesh too. As a result the authority has developed many android applications in Bangla language!

There is all the version released from the beginning :
Android 1.0 - Alpha
Android 1.1 - Beta
Android 1.5 - CupCake
Android 1.6 - Donut
Android 2.0 - Eclair (2.0–2.1)
Android 2.2 - Froyo (2.2–2.2.3)

Simpson's 1/3 Rule

Simpson’s 1/3 rule is based on approximating the integrand by a second order polynomial .It is an extension of Trapezoidal rule where, the trapezoidal rule was based on approximating the integrand by a first order polynomial, and then integrating the polynomial over interval of integration.

It calculates the value of the area under any curve over a given interval by dividing the area into equal parts. It follows the method similar to integration by parts.  It is used to estimate the value of a definite integral.

In order to integrate any function f(x) in the interval (a,b), follow the steps given below:
Ø  Select a value for n, which is the number of parts the interval is divided into. Let the value of n be an even number.
Ø  Calculate the width, h = (b−a) / n.
Ø  Calculate the values of x0 to xn as x0 = a, x1 = x0+ h, x n-1 = xn-2 + h, xn = b.
Ø  Consider y = f(x). Now find the values of y (y0 to yn) for the corresponding x(x0 to xn) values.
Ø  Substitute all the above found values in the Simpson's Rule Formula to calculate the integral value.

When do we actually use Windows RUN(Win+R) option?
-Just simply type "tree" and we refresh our computer shortly.That's it.
But I collected some extra very important shortcut which really help you to save your time. So, Let's fun!  :)
For calculator you have to simply type
"calc" in RUN option & calculator will appear immediately.
Very useful shortcut given below. Collect these and use in time.

Add/Remove Programs – appwiz.cpl
Adobe Photoshop (if installed)- photoshop
Bluetooth Transfer Wizard – fsquirt
Calculator – calc

Time is very important for us. Because of saving time, we use shortcut in many application  or
program. We have windows shortcut , Mac shortcut, Linux shortcut. All kind's of software also have some shortcut keys so that user can do there task quickly and easily. Facebook, one of the most popular social network. Almost everyone who use internet, use facebook. Here is some shortcut for facebook:

We may see different compilers for one programming language. Among them there are few efficient and best compilers that we can use without any problem.

A compiler is a computer program that transforms source codewritten in a programming language into another computer language which have binary code (0, 1) (means machine language). We will know about one of the efficient compilers for programming language C, Java, HTML, Python.

C Compiler:

programming languages are developing day by day and they are categorized in 5 generation until now

Level of programming languages
In all over the world, language is the source of communication among human beings. Different countries have different languages. The machine (computer) doesn't understand our common 
language. To interact with computer we should send instructions in a way the computer is supposed to understand. We use some specific language to communicate and write program in computer.

Some important sort-cut for Eclipse :

1. Manage Files and Projects    

Ctrl+N                Create new project using the Wizard
Ctrl+Alt+nCreate new project, file, class, etc.
Alt+f, then .Open project, file, etc.
Ctrl+Shift+rOpen Ressource (file, folder or project)
Alt+EnterShow and access file properties
Ctrl+sSave current file
Ctrl+Shift+sSave all files
Ctrl+wClose current file

What is Payoneer MasterCard ?

Payoneer MasterCard is a Global solutions for professionals and small businesses to receive funds, with local options to spend and withdraw.

  • Receive funds from thousands of companies worldwide
  • Spend online, in-store and withdraw at ATMs with the Payoneer Prepaid MasterCard® Card
  • Withdraw funds to your local bank account, in your local currency.

 How to Get a Payoneer Prepaid Debit MasterCard ?

Follow the following steps :

Where is the Marble? 

Raju and Meena love to play with Marbles. They have got a lot of marbles with numbers written on them. At the beginning, Raju would place the marbles one after another in ascending order of the
numbers written on them. Then Meena would ask Raju to find the first marble with a certain number. She would count 1...2...3. Raju gets one point for correct answer, and Meena gets the point if Raju fails. After some fixed number of trials the game ends and the player with maximum points wins. Today it's your chance to play as Raju. Being the smart kid, you'd be taking the favor of a computer. But don't underestimate Meena, she had written a program

What to do ?

Some times we see our friends PC Facebook homepage like this :

Here the passwords are hidden
. So let's know how to show the hidden password.
Just move the mouse pointer in the password box and then click on right button. You will have option bar like following. Just click on "Inspect Element ( Q )" button. 

Sometimes, our solar panel can't gate enough light to recharge battery. It may for trees , also can happened for weather. In rainy season and also in winter , sunlight can't reach to panel enough. So we can help solar panel to produce electricity and get rid of from load-shedding.


How do solar panels work?

A solar panel is made up of many small solar cells. Each solar cell uses light to make electricity.
We see electricity at work every day. When a person turns on a lamp, electrons move through the cord and light up the bulb. That flow of electrons is electricity.

Input and output in file :

  For taking input and produce output from a file, at first we need to create 2 text file which mean the file extension must be .txt . The file have to create in the location in which we will save our java
source code.

Topological sort:

In computer science, a topological sort or topological ordering of a directed graph is a linear ordering of its vertices such that for every directed edge uv from vertex u to vertex v, u comes before v in the ordering.
For example, in following  Directed graph , the first black vertex or in which vertex DFS find finish time should place in the last of the output. Here , DFS start traverse from Shirt, but first finished time is jacket .  So it goes to the last position of stack or link list.

Topological sort

Bubble sort algorithm implementation in java:

Bubble sort, sometimes referred to as sinking sort, is a simple sorting algorithm that works by repeatedly stepping through the list to be sorted, comparing each pair of adjacent items and swapping them if they are in the wrong order. The pass through the list is repeated until no swaps are needed,
which indicates that the list is sorted.

Breadth First Search:

Breadth First Search ( BFS ) is a searching algorithm which search the destination from root or source and explore all the neighbor nodes first, before moving to the next level neighbors. The animation will make this more clear.

To learn Breadth First Search ( BFS ) more deeply , you can download Breadth First Search in PowerPoint slide.
The following code is to implement Breadth First Search ( BFS ) in java

Programming in ANSI C by Balagurusamy:

For learning C program at a higher level, ANSI C by Balagurusamy book is wonderful.
Programming in ANSI C by Balagurusamy
To download this book now, just Click here.
Happy Coding !!

For more Computer Science pdf Book Go To all Book section.

Recommended Book for programmers:

Art of programming contest        

Data Communications and Networking

Java The Complete Reference          

Introduction to algorithm

News: International Robot Olympiad 2018 Gold winning Project (Video)

Many of us use bit torrent or U torrent software tools to download from different torrent sever.
For that we have to install extra software in our computer and takes a lot of time to download from the sever.
To solve this problem there is a online sever which will download your desire data into it's own sever and from there you can directly download files at full speed.

Step 1:
To find your files,first you need to search at the torrent Server. You will find almost of your important files in This torrent  server.
Step 2:

Introduction to algorithm,3rd edition. By Thomas H. Cormen 

About This Book (From book) :
Introduction to algorithm
Some books on algorithms are rigorous but incomplete; others cover masses of material but lack rigor. Introduction to Algorithms uniquely combines rigor and comprehensiveness.
The book covers a broad range of algorithms in depth, yet makes their design and analysis accessible to all levels of readers. Each chapter is relatively self-contained and can be used as a unit of study. The algorithms are described in English and in a pseudocode designed to be readable by anyone who has done a little programming. The explanations have been kept elementary without sacrificing depth of coverage or mathematical rigor.The first edition became a widely used text in universities worldwide as well as the standard reference for professionals. The second edition featured new chapters on the role of algorithms, probabilistic analysis and

MARI themes

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