S3 page1 Flashcards

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Variable

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A variable is a storage location in memory that stores a value used within a program. It can change throughout the program and should have a data type and identifier.

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Data type: Integer

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Function: Int() Description: Whole numbers Example: 1, 200, -128, 5

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Data type: Real

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Function: float() Description: Decimal numbers Example: 6.23, 5.00, -3.14

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Data type: String

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Function: str() Description: Array (list) of characters Example: "Hello", "Mr Jack", "Computing"

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Data type: Boolean

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Description: Either be True or False Example: True, False

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Software Development Process steps

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1. Analysis 2. Design 3. Implementation 4. Testing 5. Evaluation

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Analysis – Functional Requirements

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INPUT: What information will the program require? PROCESS: What will the program code do to change the input? OUTPUT: What information will the program return to the user?

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Python symbol: =

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Used to assign a value

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Python symbol: ==

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Used to compare values

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Logical operator: AND

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Means all facts must be true