By following the tutorial on this blog from the first tutorial to the newest one, you'll be able to develop and maintain your own database (using interbase or any database server). And you'll be able to create your own user interface as well (using delphi)
There are two kind of subroutine in Pascal : Function and Procedure . The difference between these subroutines is in return value . Function gives a return value , but procedure doesn’t. The structure of function and procedure are the same :
Here is the example of procedure and function :