'(quote quote) in scheme

Question

I\'m trying to learn scheme by myself. Could anyone tell me why \'(quote quote) will output \'quote, and \'(quote \'quote) will output

Answer 1

This expression:

'(quote quote)

... after expanding ' to (quote ) is equivalent to (quote (quote quote)), notice that the symbol quote is being quoted two times, and this expression is evaluated and printed as ''quote.

On the other hand, this expression:

'(quote 'quote)

... is equivalent to (quote (quote (quote quote))), notice that the symbol quote is being quoted three times, and this expression is evaluated and printed as '''quote.