Computer

Computer-computer is an electronic device in which the input is discrete rather than continuous,consisting of combination of numbers,letters and other characters written in an appropriate programming language and represented internally in binary nofation.

The main functional unit/components of computer are:

1.Centeral processing unit (CPU): 

The cpu is the brain of a computer system.

This unit takes the data from the input devices and processes it according to the set of instruction called program .

The ougput of processing of the data directed to the output devices for use in the output world.

CPU has two major parts called ALU and Control Unit(CU)

A).Arithmetic logic unit (ALU):

Arithmetic operation on data by adding,subtracting,multiplying and dividing one set with another.

Logical operation by using AND,OR,NOT and exclusive -or operatiin which is done by analyzing and evaluting data .

ALU of a computer system is the place where actual execution of instruction takes place during processing operation .

B).Control Unit(CU):

This unit is mainly used for generating the electonic control signal for the synchronization of various operation.

All the related function for program execution such as memory read,memory write ,I/O read ,I/O write ,execution of instruction , are synchronized through the control signal generated by control unit.

It manage and control all the operation of the computer.

2.Input unit:

An input performs following functions:

It accepts instruction and data from outside world.

It converts these instruction and data in computer acceptable form.

It supplies the converted instruction and data to computer system for further processing.

3.output unit:

An output unit performs following functions:

It accepts the results produced by a computed,which are in coded form.

It convert these coded result to human acceptable form.

It supplies the converted result to outside world.

4.storage unit:

A storage unit holds (stores):

Data and instruction required for processing (received from input devices).

Intermediate result of processing .

Result for output ,before they are released to an output devices.