• The World-Wide Web
  • Problem Solving
    		•

    Chapter 1: Computer Systems




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    slides01

    Domain Names

    • A domain name can have several parts
    • Unique domain names mean that multiple sites can have individual computers with the same local name
    • When used, an Internet address is translated to an IP address by software called the Domain Name System (DNS)
    • There is no one-to-one correspondence between the sections of an IP address and the sections of an Internet address

    The World-Wide Web

    • The World-Wide Web allows many different types of information to be accessed using a common interface
    • A browser is a program which accesses and presents information
    • A Web document usually contains links to other Web documents, creating a hypermedia environment
    • The term Web comes from the fact that information is not organized in a linear fashion

    The World-Wide Web

    • Web documents are often defined using the HyperText Markup Language (HTML)
    • Information on the Web is found using a Uniform Resource Locator (URL):
    • http://www.lycos.com
    • http://www.villanova.edu/webinfo/domains.html
    • ftp://java.sun.com/applets/animation.zip
    • A URL indicates a protocol (http), a domain, and possibly specific documents

    Problem Solving

    • The purpose of writing a program is to solve a problem
    • The general steps in problem solving are:
      • Understand the problem
      • Dissect the problem into manageable pieces
      • Design a solution
      • Consider alternatives to the solution and refine it
      • Implement the solution
      • Test the solution and fix any problems that exist

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