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Cambridge IGCSE Computer Science (0478)
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Comsci_level 2_data Representation_number Systems
G
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Question
Why do computers use binary?
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Answer
Electronic circuits can represent two reliable states, commonly 0 and 1, so binary maps naturally to on/off signals.
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1
Why do computers use binary?
2
Why is hexadecimal useful?
3
What is overflow in 8-bit addition?
4
What does a logical left shift do?
5
How does two’s complement represent a negative value?
6
How does sign-and-magnitude represent a negative value, and why is it not used in practice?
7
How does an arithmetic shift differ from a logical shift?