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Data types
- 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
- 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
- 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
- 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
- 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
- 25. Activity 3 Decimal Binary Octal Hexadecimal 45 10 1010111 2 75 8 3FC 16
- 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