chapter 1 COMPUTER 9TH CLASS

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               ::COMPUTER::

Computer is an electronic machine which is used to convert data into information.
::Applications of computer::

Landing air planes
Controlling space flights
Checking out groceries at the checkout counter
Turning on lights at a specific time
Printing books
Tracking inventory
            ::ABACUS::

Abacus was an old computer. It is a wooden rack holding horizontal wires with beads strung on them. When these beads are moved around according to some programming rules, all  regular arithmetic problems can be done.