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Answer Posted / anshu sharma
Hierarchy is used to define more specialized classes based
on a preexisting generalized
class.Example we have VEHICLE class and we can inherit this
class make more specialized
class like CAR, which will add new attributes and use some
existing qualities of the
parent class.Its shows more of a parent-child relationship
.This kind of hierarchy is called
inheritance
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write a code for this. serial_number contained in the header of the file will be read , if this serial number is less than a previous serial number within a successfully processed file, or is the same as another serial number within a successfully processed file, or if the field contains anything other than 7 digits, then the file must error with the reason ‘Invalid SERIAL_NUMBER’.
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