Learn Computer

Chapter :1   Fundamentals of Computer Part - 5 .  based on purpose Learn Computer,   based on purpose : On the basis of purpose, computers are categorised as following General Purpose These computers are designed to work on different types of applications. In these types of computers the  programs are not stored permanently rather programs are input at the time of their execution. Personal  computers, including desktops, notebooks, smart phones and tablets, are all examples of general-purpose  computers. Various tasks can be accomplished by using general purpose computers : For example writing and  editing (word processing), manipulating different facts and figures in various databases, tracking manufacturing  inventory, making scientific calculations, controlling organization’s security system, electricity consumption,  building temperature etc. Special Purpose Special-Purpose computers are task specific computers and are designed to so...

Chapter :1  Fundamentals of Computer Part - 4 .  Five Generations of Computers..! Learn Computer, First Generation of Computers (1942-1955) The beginning of commercial computer age is from UNIVAC (Universal Automatic Computer). The first  generation computers were used during 1942-1955. They were based on vacuum tubes. Examples of first  generation computers are ENIVAC and UNIVAC-1. Advantages : ◆ Vacuum tubes were the only electronic component available during those days. ◆ Vacuum tube technology made possible to make electronic digital computers. ◆ These computers could calculate data in millisecond. Disadvantages :  ◆ The computers were very large in size. ◆ They consumed a large amount of energy. ◆ Non-portable. ◆ Limited commercial use. ◆ Very slow speed. ◆ Used machine language only. ◆  Used magnetic drums which provide very less data storage. Second Generation Computers (1955-1964) The Second generation computers used transistors. The size of the co...

Chapter :1  Fundamentals of Computer Part - 3.  History of the Development of Computers Learn Computer, History of the Development of Computers: In beginning, there were no computers. To add or subtract , man used his fingers and toes. Abacus is known  to be the first mechanical calculating device. The main purpose of abacus was that additions and subtraction  coud be performed quickly. Abacus was developed by the Egyptians in the 10th centuary B.C, but the final  structure was given in the 12th centuary A.D. by the Chinese educationists. Abacus is made up of a frame in  which rods are fitted across with rounds beads sliding on the rod.  Napier Napier’s Bones in an Abacus invented by John Napier.Napier’s used the bone rods for counting purpose where  numbers were printed on them. With the help of these rods ,one could do addition, subtraction, multiplication and division speediy.  Pascal’s calculator called ‘Pascaline’ In the year 1642, Blais...

Chapter :1  Fundamentals of Computer Part - 2. Characterstics of Computer.! Learn Computer, Characterstics of Computer: The major characteristics of computers are the following:  ◆  Speed :  A powerful computer is capable of executing about 3 million calculations per second. ◆  Accuracy :  A computer’s accuracy is consistently high; if there are errors, they are due to errors in  instructions given by the programmer. ◆ Reliability :  The output generated by the computer is very reliable as long as the data is reliable. ◆Memory/Storage Capacity:  The computer can store large volumes of data and makes the retrieval of  data an easy task. ◆  Versatility:  The computer can accomplish many different things. It can accept information through various  i nput-output devices, perform arithmetic and logic operations, generate a variety of outputs in a variety  of forms, etc. ◆ Automation:  Once the instructions are fed int...

Chapter :1  Fundamentals of Computer Part -1 Learn Computer, COMPUTER : C - Commonly;  O - Oriented;  M - Machine;  P - Particularly;  U - Used;  T - for Trade;  E - Education;  R - and Research. In this age of computers there is no such activity that cannot be achieved without computers. Computer has  become an indispensable and multipurpose tool. We are breathing in the computer age and gradually computer  has become such a desire necessity of life that it is difficult to imagine life without it. This book will help you  to gain an understanding of the basic as well as advanced concepts of computers. It will cover a foundational  study of the computer hardware, software, operating systems, peripherals, the hardware maintenance etc. Concept of Computer System : A computer is an advanced electronic device that takes raw data as input from the user and processes this data  under the control of set of instructions (c...

learn android programming  Tutorials..! 1: About Android Android : Android is a Linux -based operating system designed primarily for touchscreen mobile devices such as smartphones andtablet computers. Initially developed by Android, Inc., which Google backed financially and later bought in 2005, Android was unveiled in 2007 along with the founding of the Open Handset Alliance: a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. The first Android-powered phone was sold in October 2008. Android is open source and Google releases the code under the Apache License. This open source code and permissive licensing allows the software to be freely modified and distributed by device manufacturers, wireless carriers and enthusiast developers. Additionally, Android has a large community of developers writing applications ("apps") that extend the functionality of devices, written primarily in a customized version of ...