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Why do we not use external file name other than open statement?

Why should you not use an external file name in any place other than the open statement?

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Before an external file can be used, it must be connected to an I/O unit. But I/O units are integers which may be chosen freely from zero up to a ...

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The solution gives detailed discussion on why we should not use an external file name in any place other than the open statement.

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