USER DEFINED DATATYPES
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This tutorial will give you a full introduction into USER DEFINED DATATYPES.
• USER DEFINED DATATYPES
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TOPIC12-USER DEFINED DATATYPES • USER DEFINED DATATYPES
User Defined Datatypes:
User defined data types are written by the users according to their needs.
It is derived from the basic data types.
Some of the user defined data types are:
1. Structures
2. Unions
3. Enumeration
Structures:
Structures are nothing but a collection of data items.
Structures can hold set of data items of different data types under a single name.
This data type can be created using the keyword struct.
Syntax:
struct structure-name
{
datatype member name 1;
datatype member name 2;
………………………
datatype member name n;
} structure-variable-name;
Unions:
Unions can hold set of data items of different data types under a single name.
This data type can be created using the keyword
Syntax:
union union-name
{
datatype member name 1;
datatype member name 2;
………………………
datatype member name n;
} union-variable-name;
Enumeration:
Enumerated data types are those in which a variable can contain only some specific set of values.
For Example: If a variable needs to hold only the months, it can have any one of the values from January to December.
These types of variables can be created as enumerated data types.
This data type can be created using the keyword enum.
Syntax: enum type_name{value1,value2,……valueN};