Flashcards

4. Data Representation and Data Types

Clark McDonald Computer Science AS - Level Inglês 4 flashcards

Flashcards do conjunto (4)

1Representation of data as bit patternsBit - Smallest unit of data as a single binary value, either 1 or 0.
Byte - A sequence of bits, usually 8 bits.
Word - Fixed-sized piece of data handled as a unit by the instruction set or the hardware of the processor. Usual word size of 32 or 64 bits.
2Storage of charactersAny kind of data needs to be converted into binary for the computer to understand it.
Therefore represented as a series of 1's and 0's unique to each character.
An example of a character set would be ASCII which assigns a binary number to each character on the keyboard.
3Data typesBoolean - Only holds one or two set values, either true or false.
Character - Any one character, stored in one byte. E.g. "e"
String - A block of text. E.g. "Hello"
Integer - Stores whole numbers. E.g. "23"
Real - Numerical data which can hold decimals. E.g. "4.67"
4Representation of numbers as bit patternsRules of Binary addition:
0 + 0 = 0
1 + 0 = 1
0 + 1 = 1
1 + 1 = 0, and carry to the next bit.
Rules of binary subtraction:
0 - 0 = 0
1 - 0 = 1
0 - 1 = 1, and borrow 1 from next bit.
1 - 1 = 0

Descrição: AS - Level Computer Science (Fundamentals) FlashCards sobre 4. Data Representation and Data Types, criado por Clark McDonald em 05-06-2016.
Criado por: Clark McDonald
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