Data Types and Data Structures

Numeric Data Types
Basic Data Types

• Integer whole number eg 7
• Real/float decimal point eg 7.2

Alphanumeric data types

• Char a single character, Digit or symbol eg C
• String several characters grouped  together eg Mr Smith

Boolean

• A data can only have one of two values (TRUE or FALSE, 1 or 0)

Array Definition

• A data structure that contains server data items
• of the same data type
• Grouped together with one name
• Individual items are accessed using an index
• Stored contiguously in computer memory

Use

• Instead of having variables that we have to declare at front, we can use a list, the software can go through the list easily and find the variable in the list easily.
• Fewer variables.
• Use iteration to go through the list with the given variable instead of going through each variable to find the given variable.
• They are dynamic, can change the program as it is running.
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Array Declaration

• Identifier/name
• Data type
• Dimension (1 or 2) One dimension has only has one row two dimension has a row and column.
• All arrays start at index 0