User defined data types are simply specific data types that a programmer has created for their specific code. We use these data types because it may be more advantageous to do so as it can make the code easier to understand or less error prone. There are two variants of user defined data types:

• Non composite data types and

• Composite data types

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Non Composite Data Types

 

Non composite data types work without referencing other data types meaning they do not combine multiple built-in data types into one data type.