Digital data
Representing Data
Storing Data
An info system processes Data and produces information
Data consists of raw facts and figures with no meaning attached. when data is processed it produces information
Therefore information is "Data with meaning."
62351 can be considered as data as it is sequence of digits. When we add meaning to this such as "Product number 62351 is an 8tb hard drive" we provide info.
Computers store data in binary format.
A nibble is represented/stored as 4 bits
.
A Binary digit has a value of 0 or 1
A character(such as letter or a digit)is represented by 1 byte or 8 bits
1 Kb= 1024
1 MB=1024 kbs
1 GB= 1024 MB
1 TB= 1024 GB
Data Types
Date/time
character/string
Numeric
Long date: displayed as Sunday April 1st 2018
A Character is a single letter or digit showed by codes from character set.
These terms are used to describe computer memory capacity and the capacity of external storage devices.
Integer-Can be positive or negative whole number, has no decimal or fractional parts.
Real number- include whole numbers and numbers with decimal/fractional parts can be postie or negative
Medium Date: displayed as dd-mmm-yyyy e.g 1-April-2018
Short date- displayed as dd/mm/yyyy 01/04/2018
Long time= HH:MM:SS e.g 13:26:34
Short time:=HH:MM e.g 13:26
Medium time+ HH:MM PM/AM E.g 01:26 PM
ASCII is a chracter set based on each chracter being represented by a single byte.
A String is textual data in the form of a sequence of characters.