What are the differences between Objected Oriented Programming and Procedural Oriented Programming?

Answer 1

Procedural oriented programming generally consists of a main program line that executes and does whatever it's supposed to do (branching off statements, loops etc..). You could say it is very functionally oriented like C, Fortran.

OOP is more about the entities which perform the processes than about the processes themselves. This leads to encapsulation. For ex, if you want to design a procedural program that reads in a text file and inserts the data into a database, you would have a procedure that

1. Parses the text file according to what you want,

2. Construct the necessary queries for the database,

3. Establish a connection to the database and finally,

4. Perform the data insertion.

This in OOP would consist (off the top of my head) of 3 classes;

1. Parser class which gets the data out of the textfile.

2. The query builder which returns SQL queries.

3. A Database connector class which connects to the database and performs the queries.

Here we aren't concerned with the internals of the parser or query builder. All the connector cares about is that the parser returns a dataset in a specified format and that the querybuilder returns a set of appropriate queries given the dataset.