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I’m learning some file functions and hence have a doubt.
I’m curious about why it is necessary to call close() to close a file? If I did not call close() after reading/writing a file, what things might happen? And if I did call close(),can I still use the file descriptor?
If the file has any sort of buffering behind it it and you don’t call close then you could potentially lose data.
If the OS has limited resources (e.g. number of open files) then by not closing files you are wasting system resources.
Using a descriptor once the file is closed is pointless at best, massive bug at worst (a bit like using memory after it has been freed)