Concept of Object oriented Programming

Concept of Object oriented Programming

Programming languages

Three types of programming languages

Machine languages

üStrings of numbers giving machine specific instructions

Assembly languages

üEnglish-like abbreviations representing elementary computer 

operations (translated via assemblers)

üExample:

LOAD   BASEPAY

ADD    OVERPAY

STORE  GROSSPAY

High-level languages

üCodes similar to everyday English

üUse mathematical notations (translated via compilers)

üExample:           grossPay = basePay + overTimePay

Structured Programming

üStructured programming

üDisciplined approach to writing 

programs

üClear, easy to test and debug and easy 

to modify

üStructured programming is hard and

 takes time to master

üCan handle the program complexity

 up to a certain size.

Recent Trend:  Object-oriented 

Programming

Procedure Oriented Programming

üThe problem is viewed as a sequence of 

actions and a number of functions are written 

to solve these actions.

Large problem is divided into smaller 

programs known as modular programming

üData move openly around the system

 from function to function.

üEmploys top-down approach in

 program design.

Object –Oriented Programming

üEmphasis is on data rather than

 procedure.

üPrograms are divided into objects.

üObjects can communicate with

 each other through functions.

üNew data and functions can be 

easily added whenever necessary.

üFollow bottom up approach in

 program design.