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Lecture 2 supplemental

Lecture 2 supplemental - Data Representation Supplement...

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9/7/2011 1 Data Representation Supplement Number Systems Represent values in a specific format Base10 –Decimal: 0 –9 Base2 –Binary: 0 –1 Base16 –Hexadecimal: 0 –9, A –F What are these used for?
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9/7/2011 2 Number Systems What does 999 mean? What does 101 mean? Decimal Number Systems What does 101 mean? Binary
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9/7/2011 3 Number Systems Convert 53 d to binary (Base2) Binary Conversion Data Representation This whole section is about representing data internal to a computing system: So that it’s usable So that it’s manageable So that it’s intelligently handled
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9/7/2011 4 Data Representation We have already discussed character formats ASCII EBCDIC Unicode We can logically break numbers down in 3 ways Unsigned Integers Signed Integers Floating Point Numbers Number Formats Data Representation Data Type Length Range char 1 byte Signed (-127 –127) Unsigned (0 –255) short 2 bytes Signed (-32768–32767) Unsigned (0 –65535) int 4 bytes Signed (-2,147,483,648–2,147,483,647)
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