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N5 Data Representation

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N5 Data Representation

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About this activity

Revise data represenation including binary, floating point, ASCII, Unicode, bitmap and vector

Created by

Mrs Robbie
Mrs Robbie
United Kingdom

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N5 Data RepresentationOnline version

Revise data represenation including binary, floating point, ASCII, Unicode, bitmap and vector

by Mrs Robbie
1

Humans denary binary 2 10

use the decimal ( ) or base system .
Computers use the or base system .

2

4 start Real decimal the exponent 1573237

numbers are numbers with a point , for example 376 . 456 .
The number is then stored in 2 parts , the mantissa and .
Example :
1573 . 237
Step one - " float " the point away so it is at the of the number
. 1573237
Mantissa =
Exponent is the amount of times you have moved the decimal point - 4 times
Exponent =

3

number text 7 256 character 8

To represent in a computer system , we give each its own special .
Extended ASCII is a version that supports representation of different characters . This is because extended ASCII uses eight bits to represent a character as opposed to seven in standard ASCII 
ASCII - bits
Extended ASCII ? bits

4

less more Unicode 8 16

As more languages became popular ASCII was not enough as it didn ? t represent enough characters .
can store 65 , 536 characters however takes up space in the computer .
It uses bits .

5

memory pixels objects bit resolution

A bit mapped graphic is a 2D array ( grid ) of . The total number of pixels in an image is known as the , and the number of colours that can be used is determined by the depth .

6

objects coordinates attributes Colour pixels

Vector graphics are stored as a list of with . Some examples of attributes are :
Line Colour
Fill
Line thickness
X and y

 
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