摘要： Exercise 4.27.Suppose we type in the following definitions to the lazy evaluator:(definecount0)(define(idx)(set!count(+count1))x)Give the missing values in the following sequence of interactions, and ... 阅读全文

摘要： Exercise 4.25.Suppose that (in ordinary applicative-order Scheme) we defineunlessas shown above and then definefactorialin terms ofunlessas(define(factorialn)(unless(=n1)(*n(factorial(-n1)))1))What ha... 阅读全文