Lecture4 Info Rep

Lecture4 Info Rep - FAST, National University of Computer...

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Unformatted text preview: FAST, National University of Computer and Emerging Sciences, Islamabad Lecture 4: Information Rep Course: Programming For Engineers-1 Asma Ahmad Information Representation There are two types of information representation. External representation Internal representation External Representation :- the way in which information is represented by the humans and the way it is entered by a keyboard or displayed on a printer or screen. Internal Representation :- of information is the way it is stored in the memory of a computer or passed to any device of computer. Information Representation Externally, computers do use decimal digits, sign/magnitude notations, and the familiar 26-character alphabets. However, virtually every computer ever build stores data- numbers, letters, graphics- internally using the binary numbering system . Memory A B C 01000001 A A Keyboard Screen External Representation Internal Representation Why binary? Electronic bi-stable environment on/off, high/low voltage Bit: each bit can be either 0 or 1 Reliability With only 2 values, can be widely separated, therefore clearly differentiated drift causes less error Example: Computer Uses Binary System Binary Representation in Computer System All information of diverse type is represented within computers in the form of bit patterns ....
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Lecture4 Info Rep - FAST, National University of Computer...

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