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What is data type of FILE in C or in other language? Is it an integer or structure or having no particular data type?
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It is what is typically termed an opaque data type, meaning it's typically declared as a simple structure, and then internally in the OS libraries the FILE pointer is cast to the actual date-type of the data-structure that the OS will use access data from a file. A lot of these details are system-specific though, so depending on the OS, the definition may differ.
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