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Data types
1.
2.
3.
Why are they
needed? 3 2 1
4.
Hi I am
going to tell you about why computers require data types and data structures.
5.
INPUT Firstly, when
we use a computer that is classified as INPUT.
6.
This raw rata
is converted into binary – machine code via the electronic signals on the computers keyboard.
7.
As you know
this information needs to be processed so information can be generated and OUTPUTTED.
8.
However, this data
must be stored in similar categories for processing.
9.
A B C
1 55 7 8 90 22/3/80 $22.00 All the data is filtered into categories for storage and subsequent processing. Integer Character String Date
10.
So therefore we
need data types to organise data for processing.
11.
Examples of Data
DATA
12.
13.
How is data
stored? 1001 1002 1003 1004 1005 Computer - Store 10 in 1001 Programmer – Num1 = 10 10 Num1
14.
How is data
stored? 1001 1002 1003 1004 1005 Computer - Store 12 in 1002 Programmer – Num2 = 12 10 12 Num2
15.
How is data
stored? 1001 1002 1003 1004 1005 Computer – ADD 1001 to 1002 and STORE in 1003 Programmer – Total = Num1 + Num2 10 12 22 Total
16.
17.
18.
Binary Number System
Number 1 0 1 1 1 Binary Place 2 4 2 3 2 2 2 1 2 0 Binary Place Value 16 8 4 2 1 Binary Calculation 1 x 2 4 0 x 2 3 1 x 2 2 1 x 2 1 1 x 2 0 Binary Value 16 0 4 2 1 Binary Total = 16 + 4 + 2 + 1 = 23
19.
20.
Octal Number System
Number 3 4 5 2 1 Octal Place 8 4 8 3 8 2 8 1 8 0 Octal Place Value 4 096 512 64 8 1 Octal Calculation 3 x 8 4 4 x 8 3 5 x 8 2 2 x 8 1 1 x 8 0 Octal Value 12 288 2 048 320 16 1 Octal Total = 12 288 + 2 048 + 320 + 16 + 1 = 14 673
21.
22.
Hexadecimal Number System
Number 1 2 4 A C Hex Place 16 4 16 3 16 2 16 1 16 0 Hex Place Value 65 536 4 096 256 16 1 Hex Calculation 1 x 16 4 2 x 16 3 4 x 16 2 10 x 16 1 12 x 16 0 Hex Value 65 536 8 192 1 024 160 12 Hex Total = 65 536 + 8 192 + 1 024 + 160 + 12 = 74 924
23.
24.
25.
Activity 3 Decimal
Binary Octal Hexadecimal 45 10 1010111 2 75 8 3FC 16
26.
27.
Activity 4 DATA
TYPE DESCRIPTION EXAMPLES Integer 5 0 -4 87 Floating Point 2.764 -67665.3 2.3 x 10 8 String Cat Daggy2 Eggplant Boolean True False Yes No Date 16/1/2006 4 th June 2001 Currency $5.84 -$58.97 $1005.46
28.
29.
30.
31.
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