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When we enter a variable then we know it what type it belong ,but the compiler does not know it ,for knowing it we declare data types. Storage representations & machine instructions to handle constants differ from machine to machine.The variety of data types available allow the programmer to select the type appropriate to the needs of the application as well as the machine.

ANSI C supports 3 types of data types

1.Primary data types

2.Derived data types

3.User defined data types

JAVA has 2 types

1.In Built data types

2.User Defined datatypes

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