Chapter 3 Computers in Your Future Template

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Chapter
2
System Software and Software Development
Module 3A System Software Module 3B Programming
Languages
Chapter
3
System Software

• Operating Systems (OS) The Computers Traffic
  Cop
• Exploring Popular Operating Systems A Guided
  Tour
• System Utilities Tools for Housekeeping

Module
A
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System Software
Operating Systems

• kernal/supervising program
• memory resident

The OS is much like a computerized version of a
traffic cop, standing at the intersection of the
computers hardware, application programs, and
the user.
Module
A
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Operating Systems
System Software

• Managing Programs
• single-tasking
• multitasking
• foreground application
• background application
• multiprocessing

Module
A
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Operating Systems
System Software
The OS manages programs, parcels out memory,
deals with input and output devices, and provides
means of interacting with the user
Module
A
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Operating Systems
System Software

• Managing Memory
• partition
• virtual memory
• swap file
• Handling Input and Output
• device drivers

Module
A
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User Interface
System Software

• Types of User Interface
• command-line
• menu driven
• graphical user interface (GUIs)
• User Interface functions
• gain access (log on)
• start (launch)
• manage disks and files
• shut down safely

Module
A
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Exploring Popular OS
System Software

• Unix
• Xerox PARC the first GUI
• MS-DOS
• Mac OS
• Microsoft Windows 3.x

Module
A
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Exploring Popular OS
System Software

• Microsoft Windows 95 and 98
• Microsoft Windows CE
• Microsoft Windows NT
• Linux

Module
A
For the latest on Linux, visit Linux online
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System UtilitiesTools for Housekeeping
System Software

• Backup utilities
• Antivirus software
• File compression utilities
• File defragmentation programs

Module
A
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Antivirus Software
System Software
Norton AntiVirus is a utility that works by
examining all the files on a disk, looking for
the tell-tale "signatures" of virus code
Module
A
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Programming Languages

• First Generation 1s and 0s
• Second Generation A little Easier
• Third Generation Programming Comes of Age
• Fourth Generation Getting away from
  Procedure
• Object Oriented A Revolution in the Making?
• A Guide to Programming Languages One Size
  doesnt Fit All

Module
B
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Programming Languages
Programming Languages

• First Generation
• machine language 1s and 0s
• machine dependent
• Second Generation
• assembly language
• low-level
• mnemonics

Module
B
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Third-Generation Languages (3GL)
Programming Languages

• Description
• Procedural
• high-level
• Compilers
• source code/object code
• low-level
• Interpreters

Module
B
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Third-Generation Languages (3GL)
Programming Languages

• Spaghetti Code
• software crisis
• Structure Programming
• Pascal/Algol
• low-level
• Modular Programming

Module
B
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Fourth-Generation Languages (4GL)
Programming Languages

• report generators
• query languages
• Structured Query Language (SQL)
• natural language

Module
B
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Object-Oriented ProgrammingA revolution in the
making
Programming Languages

• Eliminating the program vs data distinction
• What is an object?
• Classes
• Inheritance
• Rapid Application Development (RAD)
• Middleware

Module
B
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A Guide to Programming Languages
Programming Languages

• COBOL
• business programming
• Y2K
• Fortran
• scientific/mathematical/engineering
• good for complex problems

Module
B
Learn more about COBOL by reading the FAQ located
on the Oxford University Library Automation
Service
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Structured Modular Languages
Programming Languages

• Ada
• Visual Basic
• event-driven
• Vbscript
• ActiveX controls
• Pascal

Module
B
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Object Oriented Languages
Programming Languages
include ltiostream.hgt void main () cout
ltltHello World!

• Smalltalk
• C and C

A simple C program that prints Hello World to
the screen
Module
B
If youre thinking about a career in computer
science, C is the language to learn. For more
information see the C Virtual Library and C
FAQ Lite
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Object Oriented Languages
Programming Languages

• Java
• JavaScript

class Hello World public static void main
(String args ) System.out.println
(Hello World!)
Simple Java code
Module
B
To learn more about Java, visit Javas home page
at Sun Microsystems