Evolution of Object Oriented Programming Approach

The various categories of programming approaches are classified as follows.

a) Monolithic Programming Approach.

b) Procedural Programming Approach.

c) Structured Programming Approach.

d) Object Oriented Programming Approach.

Monolithic Programming Approach

In Monolithic Programming Approach the program consist of sequence of statements that modify data which is global throughout the whole program.The Program control is achieved through the use of jumps (i.e. goto statements) and code is duplicated each time as there is no support for the function.Data is not fully protected.So this approach is usefull for developing small and simple programs.The programming languages like ASSEMBLY and BASIC follow this approach.

Procedural Programming Approach

Procedural Programming Approach is top down approach in which program is divided into functions that perform a specific task.Data is global and all the functions can access the global data.Program flow control is achieved throw the use of jumps and function calls.This approach avoid the repetition of code.The programming languages like FORTRAN and COBOL follow this approach.

Structured Programming Approach

The basic principal of Structured Programming Approach is to divide a program into functions and modules.Each module has set of related functions.The programming languages like PASCAL and C follow this approach.

Object Oriented Programming Approach

The Object Oriented Programming Approach came to remove some of the flaws encountered int procedural approach for designing large and complex programs.The basic principal of Object Oriented Programming Approach is to combine both data and functions that operate on that data into a single unit.Such a unit is called an object.

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Generation of Computers

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Computer Memory

Memory : A memory is just like a human brain. It is used to store data and instructions. Computer memory is the storage space in computer where data is to be processed and instructions required for processing are stored. The memory is divided into large number of small parts. Each part is called cell. Each location or cell has a unique address, which varies from zero to memory size minus one. The computer storage memory is measure in term of Bytes. Eight bits make one Bytes. (Measure units) Primary Memory/Main Memory Primary memory holds only those data and instructions on which computer is currently working. Has limited capacity and data gets lost when power is switched off. It is also called main memory. It is generally made up of semiconductor device. These memories are not as fast as registers. The data and instructions required to be processed earlier reside in main memory. Characteristic of Main Memory · These are semiconductor memories. · It

Notes For BCA Students

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