Cambridge AS & A Level Computer Science
1.1Data representation
Data representation in Cambridge AS & A Level Computer Science: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic62 practice questions3 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 1.1.1Distinguish binary prefixes (kibi, mebi, gibi, tebi) from decimal prefixes (kilo, mega, giga, tera).
- 1.1.2Convert integers between binary, denary and hexadecimal, and use Binary Coded Decimal and one's and two's complement representations.
- 1.1.3Add and subtract binary numbers and explain how overflow can occur.
- 1.1.4Describe practical uses of BCD and hexadecimal.
- 1.1.5Represent character data in binary using ASCII, extended ASCII and Unicode.
Lessons
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Character sets: ASCII, extended ASCII, Unicode and EBCDIC
40 min
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Negative binary integers and binary arithmetic
50 min
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Number systems: binary, denary, hexadecimal, octal and BCD
45 min
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Sample question
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