DIGITAL COMPUTER

Computer is an electronic device characterised by the following properties :
1.High processing speed.
2.Can perform iterative operations.
3.Has a large storage capacity.
4.Can take decision if proper program is written.
5.It is capable of accepting information in various forms from outside
world and can provide results in various forms.


Any information stored or processed by computer is in the form of data.But before storing or  processing, the data needs to be converted into suitable  form.
The way of transforming the data into suitable form so that it can be stored or processed by computer is  called representation of information.

There are two ways of representing the information :--

1.External Data Representation.
2.Internal Data Representation. 

Numeric and Non-numeric Data :-
The information in a proper form is a data.There are two basic types of data;binary number or octal number over these numbers,Each number has a value.
On the other hand non-numeric data includes letters and special symbols.e.g.A,B,+,$,*etc.are non-numeric data.Even space is also a non-numeric data.These are popularly known as characters.
Name of a particular person or a place such as MUKESH, INDORE form String of characters.
Each character in the computer,ASCII and EBCDIC are two popular character codes.