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I'm trying to learn scheme by myself. Could anyone tell me why '(quote quote) will output 'quote, and '(quote 'quote) will output ''quote?
Thank you very much!
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This expression:
... after expanding
'<something>to(quote <something>)is equivalent to(quote (quote quote)), notice that the symbolquoteis being quoted two times, and this expression is evaluated and printed as''quote.On the other hand, this expression:
... is equivalent to
(quote (quote (quote quote))), notice that the symbolquoteis being quoted three times, and this expression is evaluated and printed as'''quote.Take a look at (free, online) How To Design Programs, intermezzo 2. It explains quote in terms of list and cons. If anything in that explanation doesn't make sense, just back up a bit in the textbook.