History of Computer

                      The history of computer starts from 4000 years ago. History of computer means the gradual change in the concepts over a long period of time. Around fifth century Hindu philosophers developed a new method of counting the numbers from 0 to 9 can be preformed with the help of fingers. The development of counting device called ABACUS and it is developed by Chinese people. It was first used for computation's in 3000 BC.
                        In 1614AD, a Scottish mathematicians John Napier discovered the concept of logarithms. In 1617AD, he constructed a set of rods called Napier Bones for doing mathematical calculation easily. After the invention of logarithms in 1617AD,William Oughtered invented the slide rule in 1620. This device was made on the principal of logarithms. Pascals calculating was developed by Blaise Pascal in 1642. It was a mechanical calculator that used toothed wheels and gears. Leibniz's calculator was made by a German philosopher G.V Leibniz's in 1671AD it was based on pascal principal. In 1822AD an English Mathematicians invented a machine called Difference engine. with mechanical memory to store results . A