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 prerecorded list of instructions
(a program). Computer is a general purpose device that can be programmed to
carry out a finite set of arithmetic or logical operations. Since a sequence of
operations can be readily changed, the computer can solve more than one kind of
problem.
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