JSS3(Year 9) Computer Topics

Digital Divide

Database

Spreadsheet

Computer Careers Opportunities

Computer Viruses

Internet Search Engines

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BASIC Programming Language for SS1

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BASIC Programming Language for SS1 BASIC stands for Beginners All-purposed Symbolic Instruction Code. It was developed in 1964 by Professor John Kemeny and Thomas Kurtz to teach students at Dartmouth College. It has undergone series of historical development, which has resulted in several forms of the language. Versions of BASIC 1. BASICA 2. GWBASIC 3. Torbo BASIC 4. Quick BASIC 5. VB.NET BASIC CHARACTER SET 1. Alphabetic Characters – A to Z 2. Numeric Character – 0 to 9 3. Special Characters – 0 + % ^ # = ( ) etc BASIC VARIABLES A variable is a quantity that changes during the execution of a program. It can also be defined as a name that is used to represent some storage location. Types of Variable 1. Numeric Variables : These are used to store numeric values such as 23, 98, etc. There are two major types of numeric variables, which are; Integer variable and real variable a. Integers are whole numbers without decimal places. b. Real numbers are numbers with decimal places Hence Integ...
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Computing Devices I ( Pre-Computer to 19th Century) for SS1

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Computing Devices I ( Pre-Computer to 19th Century) for SS1 Man has put every effort to have better method of calculations. As a result of man’s search for fast and accurate calculating devices, the computer was developed. 19 th Century Device Some of the 19 th century devices are: Abacus, Napier’s bones, Pascal’s calculator, Leibniz multiplier Jacquard’s Loom, Charles Babbage’s engine, Hollerith Census machine and Borrough’s machine. Abacus The first calculating device was probably the Abacus. The Chinese invented it. Components: It is made up of frame divided into two parts by a horizontal bar and vertical threads. Each thread contains some beads. It is known as Soroban in Japan and Suan Pan in china. Uses : to do simple addition and subtraction Napier’s Bone : In 1617 an eccentric (peculiar, unusual person) Scotsman mathematician named John Napier invented Logarithm which is a technology that allows multiplication to be performed via addition. Components : A set of eleven rods, wit...
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Overview of Computer System for SS1

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Overview of Computer System for SS1 Definition of Computer System  Computer system can be defined as an electronic device which manipulates data and produces output using step-by-step instructions. A programmable machine that receives, stores, retrieves, processes and outputs data. A computer may be defined as a machine that can solve problems by accepting data, performing certain operations and presenting the results of those operations under the direction of detailed step by step instructions. Constituents of a Computer The two major constituents of the computer are hardware and software 1. Hardware : Hardware can be defined as all the parts of the computer that are tangible. I.e. they are the parts of the computer you can see, touch, or handle. Examples of Hardware The following list represents a basic set of set of hardware found in most computers a. PC case, b. Motherboard, c. Hard Disk Drive (HDD), d. Floppy Disk Drive (FDD), e. Compact Disk Drive (CDD), f. Digital Video Disk...
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