Data Representation

Character and numbers are understandable and usable by people therefore people feed them to the computer and they expect the result of computation or interaction from computer as output many time in the same form i.e, characters of text of character after processing must appear for them as in English like natural language and processed numbers or results as represented in decimal and in accordance with mathematical notation.

External Data Representation:

Natural (English) language characters and decimal numbers are usual be and understandable by the people and termed as External Data Representation. But as such the computer being electronic machine cannot understand and use natural language symbols and decimal numbers directly. External data Representation does not hold good for computations inside the machine.

Internal Data Representation:

The internal representation of data inside the computer machine must be acceptable by machine and suit the electronic concepts. This led to the development of separate machine language which is in binary form, consequently the data to be processed must also be in binary form. different methods of representing natural language symbols and decimal numbers in binary form inside the machine constitute, internal data representation.

The characters and numbers are fed to the computer machine and the results produced from the machine, must be in a form that is usable and understandable to the external world; irrespective of internal data representation. The external input to the computer and external output from the computer will normally be natural language symbols and characters, numbers in decimal form.

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