Problem Detail: Is there any difference between free variable and global variable? Or they are just synonyms? In which situations I should use one or another?
Asked By : rook
Answered By : Gilles
They don’t play in the same category. The notion of free variable is relative to a scope. If a variable is present in a term (i.e. a subprogram) and its scope is larger than this term, then the variable is said to be free in that term. A global variable is one whose scope is the whole program, or the whole file, or the whole module, or whatever scope is called “global” in the programming language you’re considering.
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