<blockquote> What is data type of FILE in C or in other language? Is it an integer or structure or having no particular data type? </blockquote>

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 <code>FILE</code> 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.

What is datatype of FILE? [duplicate]

1 Answers

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.