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TypeDef In C
Typedef is a keyword in C language, which you can use to give a type a new name. Following is an example to define a term BYTE for one-byte numbers
After this type definition, the identifier BYTE can be used as an abbreviation for the type unsigned char, for example.
By convention, uppercase letters are used for these definitions to remind the user that the type name is really a symbolic abbreviation, but you can use lowercase, as follows −
You can use typedef to give a name to your user defined data types as well. For example, you can use typedef with structure to define a new data type and then use that data type to define structure variables directly as follows
When the above code is compiled and executed, it produces the following result
typedef vs #define
#define is a C-directive which is also used to define the aliases for various data types similar to typedef but with the following differences −
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typedef is limited to giving symbolic names to types only where as #define can be used to define alias for values as well, q., you can define 1 as ONE etc.
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typedef interpretation is performed by the compiler whereas #define statements are processed by the pre-processor.
The following example shows how to use #define in a program
When the above code is compiled and executed, it produces the following result −
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