! INTRODUCTION !

The word computer has been taken from word “COMPUTE” that means to calculate. Computer has influenced every field of life. Computers are versatile and can handle multiple applications like Documentation, Accounting, Budgeting, Designing, Weather, Forecasting etc at a time. It can store the number and instruction and do the computation again and again. Computer is used for prepare results or the marks obtained by various student in various subjects.

! DEFINATION  OF  COMPUTER !

Computer is an electronic device in which we can feed data, read data, write data, compare data and gives the desired result.

C      COMMON
O      OPERATING
M      MACHINE
P        PARTICULARLY
U       USED FOR
T       TRADE
E       EDUCATION
R       RESEARCH

Here we can say that the computer is a commonly operating machine particularly used for technology and educational research. It can perform tasks such as coping, moving, comparing and performing non-arithematic operations or alphabetical, numerical and other symbols used to represent objects.

! CHARACTERISTICS OF COMPUTER  !

1.    Speed:~ Computer can do calculations at the superfast speed without any mistake. A modern computer can execute about thirty million instructions in one second.

2.    Accuracy:~ Computer never gives wrong results nature. Infact the most computer errors are crused due to wrong input of data and instructions.


3.    Diligence:~ It is away from basic human nature. It never bored or tired and it can work for long times without creating any error.

4.    Storage Capacity:~ It can store a large amount of information in a very small space. We can display the stored information whenever desired.

5.    Versatility:~ It is one of the most wonderful thing about computer. It can do various jobs at one time.

6.    Automatic:~ They are capable of automatically performing repitive or long process without making any errors.

7.    Power Of Remembering:~ It can store or recall any information as well as when we required. Computer does not make any guess or forget.

! LIMITATIONS OF COMPUTER !

1.    No Feelings:~ Computers are not living. Hence, can’t make judgement of its own. Its instructions are based on information given to it in form of program.

2.   It is Dumb:~ Computer posses no intelligence of it’s own. It’s I.Q. is zero. Computer can’t take it’s own decision in this regard.

! STRUCTURE OF COMPUTER !

1.   Input Unit:~ Input unit is responsible for taking input and converting it into computer understandable form. Input unit are Keyboard, Mouse. Light Pen, joy stick, Magnetic Disk, Floppy disk etc.

2.    Output Unit:~ An output unit allows processed information to be output from the computer. Its coming from the CPU in the form of binary signals which needs conversion in human understandable form. Output devices are Monitor, printer, Speaker, Coder, Plotter etc.

3.    CPU:~ Centrol Processing Unit is the brain of the computers. Without CPU our data can’t be stored or processed. This is used to store program or data and obey the instructions contained in program. It is divided into three parts.

1.    Control Unit
2.    Memory Unit
3.    Arithmatic and Logical Unit.