Data types and structures Revision

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Integer
Whole, positive number.
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String
A collection of alpha-numeric characters, white space and punctuation.
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Boolean
Variable which can be set to either True or False.
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Real Number
A more advanced number system than integers allowing for rational and irrational numbers, decimal places and negative numbers.
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Floating Point Number (Float)
Real numbers including decimal points.
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Array
Contains several items which are all the same data type and size. (List, in Python)
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Record
Stores data items of different types under one identifier
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Serial File
A collection of records stored one after the other in no particular order.
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Sequential File
A collection of records stored one after the other in a key sequence.
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Index Sequence File
A collection of records is stored one after the other in a key sequence, but an index is stored as well. This allows you to access records directly or process all of them in sequential order.
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Direct Access File
If all records in a sequential file have the same fixed length you can read the content directly by calculating the address.
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Random Access File
A file where you can access any record directly using the address.
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Hashing Algorithm
Used to calculate the disk address.
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Other cards in this set

Card 2

Front

A collection of alpha-numeric characters, white space and punctuation.

Back

String

Card 3

Front

Variable which can be set to either True or False.

Back

Preview of the back of card 3

Card 4

Front

A more advanced number system than integers allowing for rational and irrational numbers, decimal places and negative numbers.

Back

Preview of the back of card 4

Card 5

Front

Real numbers including decimal points.

Back

Preview of the back of card 5
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