Dec 5, 2007: C, C++, LAN, WAN, The Internet

The History of C & C++

C++ evolved from C, which evolved from previous two programming languages, BPCL and B. (.....).

The C language was evolved from B, by Dennis Ritchie at Bell Laboratories and was originally implemented on a DEC PDP-11 computer in 1972 ...

C uses many important concepts of BPCL and B while adding data typing and many other features. C initially became widely known as the development language of the UNIX operating system. Today, most operating systems are written in C and/or C++. C is now available for most computers. C is hardware independent. With careful design, it is possible to write C programs that are portable to most computers.

Writing C++ Statements

Write a C++ statement to accomplish each of the following
tasks:
a) Declare a variable sum and x to be of type int.
b) Initialize variable x to 1.
c) Initialize variable sum to 0.
d) Add variable x to variable sum and assign the result to variable sum.
e) Print “The sum is: “ followed by the value of variable sum.

Computer Networks

Often organizations use a network of personal computers, which allows users to operate independently or in cooperation with other computers, exchanging data and sharing resources. Such a setup is called a local area network (LAN).
Wide Area Network (WAN) is a computer network that covers a broad area (i.e., any network whose communication links cross regional or national boundaries). Or, less formally, a network that uses routers and public communication links.

The largest and most well-known example of a WAN is the Internet.
Users who connect their computers via the phone lines must use a hardware called a modem to reconcile the inherent differences between computers and the phone system.

The Internet

The Internet is a worldwide, publicly accessible series of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP).
It is a "network of networks" that consists of millions of smaller domestic, academic, business, and government networks, which together carry various information and services, such as electronic mail, online chat, file transfer, and the interlinked web pages and other resources of the World Wide Web (WWW).
With a software called browser, a user can manipulate a mouse to point and click on screen text or pictures to explore the Internet, particularly the World Wide Web (www or the Web), an Internet subset of text, images, and sounds linked together to allow users to view a site.
A home page is the first page of a Web site.