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INPUT & OUTPUT DEVICES     Input devices are used to feed data and instruction to the computer. The result produced by the CPU s in the form of electronic binary signals It has to be converted to a form, which can be understood by human beings This function is performed by Output Units. 1. Input Devices These are the various input devices. 1.1 Keyboard         Keyboard is one of the primary means by which we communicate with the computer. There are many different types of computer keyboards: wired, wireless, ergonomic, and multimedia. Although there may be differences in the location of some keys or features, keyboards are very similar and allow you to accomplish basically the same tasks. A typical PC keyboard is shown in the figure below.         The computer keyboard very similar to typewriter keyboard, with the addition of special keys including numeric keypad, navigation and editing keys, direct...

Functional Units Of Computer Input Unit                Computers need to receive data and instructions in order to solve any problem Therefore we need to put the data and instructions into the computers, and the input unit perform this task The input unit consists of one or more input devices. The keyboard of your computer is one of the most commonly used input devices, other devices include mouse, floppy disk drive, hard disk drive, CD-ROM, scanner and magnetic tape. Regardless of the type of Input device used in a computer system, at input devices perform the following functions: ◆ Accept data and instructions from the outside world ◆ Convert it to a form that the computer can understand ◆ Supply the converted data to the computer system for further processing Output Unit           The output unit of a computer provides the information and results of a computation to the Outside world. As you know.c...

Overview of C++ History of C++             C++ was written by Bjarne Stroustrup at Bell Labs during 1983-1985. C++ is an extension of C. Prior to 1983, Bjarne Stroustrup added features to C and formed what he called "C with Classes". He had combined the Simula's use of classes and object-oriented features with the power and efficiency of C. The term C++ was first used in 1983. C++ was designed for the UNIX system environment. With C++ programmers could improve the quality of code they produced and reusable code was easier to write.         Bjarne Stroustrup had studied in the doctoral program at the Computing Laboratory at Cambridge University prior to joining Bell Labs. Now, Bell Labs no longer has that name since part of Bell Labs became AT&T Labs. The other half became Lucent Bell labs. Prior to C++, C was a programming language developed at Bell Labs circa 19691973 The UNIX operating system was also being developed...

COMPUTER                 The word computer was first recorded as being used in 1613 and originally had been used to describe a human who performed calculations or computations. The definition of a computer remained the same until the end of the 19th century when people began to realize that machines never get tired and can perform calculations much faster and more accurately than any team of human-computers ever could                 A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program. It is designed to execute applications and provides a variety of solutions by combining integrated hardware and software components. CHARACTERISTICS OF COMPUTERS 1.Speed  :.  Present-day computers operate at very high speeds. A computer can perform several million instructions (calculations) in...