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What is Operator overloading ?

When an operator is overloaded, it takes on an additional meaning
 relative to a certain class. But it can still retain all of its old meanings.
 Examples:
 1) The operators >> and << may be used for I/O operations because
 in the header, they are overloaded.
 2) In a stack class it is possible to overload the + operator so that it
 appends the contents of one stack to the contents of another. But the
 + operator still retains its original meaning relative to other types of
 data.