Computer software - lecture - Introduction to progamming - ICP01, Lecture notes of Computer Numerical Control

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Computer Software

Computer software is the key to productive use of

computers. Software can be categorized into two

types:

 Operating system software

 Application software.

Operating System Software

Operating system software tells the computer how to perform the functions of loading, storing and executing an application and how to transfer data. Today, many computers use an operating system that has a graphical user interface (GUI) that provides visual clues such as icon symbols to help the user. Microsoft Windows 98 is a widely used graphical operating system. DOS (Disk Operating System) is an older but still widely used operating system that is text-based.

Word Processing

• (^) Word Processing software is used to create and print documents. A key advantage of word processing software is that users easily can make changes in documents.

Electronic Spreadsheets

• (^) Electronic spreadsheet software allows the user to add, subtract, and perform user-defined calculations on rows and columns of numbers. These numbers can be changed and the spreadsheet quickly recalculates the new results.

Presentation Graphics

• (^) Presentation graphic software allows the user to create documents called slides to be used in making the presentations. Using special projection devices, the slides display as they appear on the computer screen.