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abstract your answer to exercise 230 to produce a procedure tree-map with the property that square-tree could be
define a procedure square-tree analogous to the square-list procedure of exercise 221 that is square-list should behave
a binary mobile consists of two branches a left branch and a right branch each branch is a rod of a certain length from
write a procedure fringe that takes as argument a tree represented as a list and returns a list whose elements are all
qmodify your reverse procedure of exercise 218 to produce a deep-reverse procedure that takes a list as argument and
give combinations of cars and cdrs that will pick 7 from each of the
suppose we evaluate the expression list 1 list 2 list 3 4give the result printed by the interpreter the corresponding
the procedure for-each is similar to map it takes as arguments a procedure and a list of elements however rather than
louis reasoner tries to rewrite the first square-list procedure of exercise 221 so that it evolves an iterative
the procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers
because internal definitions look sequential but are actually simultaneous some people prefer to avoid them entirely
9 ben bitdiddle alyssa p hacker and eva lu ator are arguing about the desired result of evaluating the expressionben
draw diagrams of the environment in effect when evaluating the expression in the procedure in the text comparing how
in this exercise we implement the method just described for interpreting internal definitions we assume that the
given a one-argument procedure p and an object a p is said to haltamp39amp39 on a if evaluating the expression p a
eva lu ator and louis reasoner are each experimenting with the metacircular evaluator eva types in the definition of
scheme allows us to create new bindings for variables by means of define but provides no way to get rid of bindings
the procedures set-variable-value define-variable and lookup-variable-value can be expressed in terms of more abstract
instead of representing a frame as a pair of lists we can represent a frame as a list of bindings where each binding is
by using data abstraction we were able to write an eval procedure that is independent of the particular syntax of the
many languages support a variety of iteration constructs such as do for while and until in scheme iterative processes
named letamp39amp39 is a variant of let that has the form he and are just as in ordinary let except that is bound
let is similar to let except that the bindings of the let variables are performed sequentially from left to right and
let expressions are derived expressions becauseimplement a syntactic transformation let-gtcombination that reduces