· What is abacus?

·        What is abacus?

·        Abacus was the earliest counting machine. It has two parts called earth and heaven. It was made by wood. It could only add and subtract. It believed to be discovered in china. It is believed that the fast counting machine. It helped to develop the computer system.

* Who is the father of modern Computer and Why?

-         Charles Babbage is known as the father of modern computer. He was the great mathematician of Cambridge University. He developed two electronically calculators called differing engine in 1822 and analytical engine in 1833. They were great achievement in the field of computer history. Not only those calculators, he also discovered the working principle of modern computer. For overall contribution in computer sector he is called as or known as father of modern computer.

·        What is the contribution of Dr. Herman Hollerith in the history of computer?

-         Dr Herman Hollerith was the great statistician of US. He is remembered in the history of computer for the following contribution.

-         He invented the tabulating machine (in 1886), which was used for census calculation.

-         He is the first who used the punch card.

-         He developed TMC into IBM, which is world’s largest computer manufacturing company until today.

·        Contribution of john van Newman in the history of computer.

-         John van Newman was a mathematician in 1945 AD who discovered a principle of stored program at the first so, he called father of stored program. Before his principle program were stored permanently in chips so modification was impossible but after van Neman such program were store inside storage media and hence inside modification was easy and flexible.