A computer is a programmable machine. The two principal characteristics of a computer are: it responds to a specific set of instructions in a well-defined manner and it can execute a list of instructions. computer is a general purpose device.a sequence of operations can be readily changed, the computer can solve more than one kind of problem.
Modern computers based on integrated circuits are millions to billions of times more capable than the early machines. in computer the processing element carries out arithmetic and logic operations. Peripheral devices allow information to be retrieved from an external source, and the result of operations saved and retrieved.
Computer work fast enough, when we talk about computers, so sec mini, micro second, do not talk, but we have much work it takes 10-12 seconds to a computer. The First mechanical computer designed by charles Babbage was called Analytical Engine.
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