Prabin Kalikote

A French mathematician, Blaise Pascal, invented the first mechanical calculator ‘Pascaline’ in 1642 AD.

Charles Babbage is considered as the father of computer since the idea used in his analytic engine led to the development of the first electromechanical computer ‘Mark-I’.

Napier's bones was the calculating device invented by John Napier and was based on the principle of logarithm which consisted of 11 sets of rectangular shaped bone rods carved with the logarithm values.

The Abacus is the first calculating device developed by human beings which is made up of a wooden frame having two parts- upper deck and lower deck which contains 11 vertical rods with each rod consisting of movable beads.
Each rod contains two beads in the upper deck (also called Heaven) and five beads in the lower deck (also called Earth).

The limitations of computers are listed below:
- Sinceit is a programmable electronic machine, it cannot work without the programs.
- It performs only those tasks which are instructed by the program.
- It cannot use its own logic and learn anything by performing the tasks.

A computer is called a versatile machine because of its capability of performing a variety of tasks.

A computer is called a diligent machine because of its capability of performing the tasks repeatedly for a long time without losing accuracy and speed.