Directory and filename
Explain directory and filename?
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A directory refers to a file which includes directory entries. The directory entry consists of a file name with structure of the information explaining the attributes of file. All the names within a directory are known as filename. The only two characters which cannot be included within a file name are “/” and “null” character.
Explain Downcast with example: It is a cast towards an object's dynamic kind - that is, `down' the inheritance hierarchy. For illustration: // Downcast from Object to String
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