Some Useful Functions

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typedef

 ◘ It is used to give another name to the previous or existing data type.
◘ It is not creating new data type.
◘ typedef data_type another_name ;

Example-



 #define

 ◘ It is also called compiler directive.
◘ It is also called pre-processor
◘ It is used to define Symbolic constants.
◘ #define pi 3.14;
◘ It is also used to define mricros (small single line statement function)

Example of micros,





 #include

 ◘ It is used to add contains of a file which is written inside the angular bracket < > .

Example -
              #include <iostream>
* It will help to include fine iostream in our program.




 #if

 ◘ It is used to test whether a compiler time condition is true.


#under

 ◘ It is used to un-define micros.

#else

 ◘ It is used to specify the alternative .
◘ It used to perform an action if a test fail.

#endif

 ◘ To end the pre-processor conditions.



By - Somesh Sah




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