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View Code? Open in Web Editor NEW《计算机程序的构造和解释》(SICP) 解题集
License: MIT License
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3.47中22行是不是可以去掉
https://github.com/hjcapple/reading-sicp/blob/master/chapter_3/exercise_3_47.scm
这个里面的22的(lock 'release)是不是应该去掉，也就是n=0的时候，为什么要先释放锁，然后再重试呢，不是应该直接重试吗？
练习1.28中的代码，是不是有问题？
博主是否有检验过答案，有运行成功吗？
我怀疑这题做的不对，理由是 notrival？过程的实参不应为base，而应该为上一次fast-prime?迭代产生的结果。
exercise_1_19.md 里的部分公式裂掉了
请问练习1.16中 定义的test模块如何使用？
即使手动单独调用test中的过程也还是不行，请问test模块要怎么运行
Welcome to DrRacket, version 8.6 [cs].
Language: racket, with debugging; memory limit: 128 MB.
(for-loop 0 10 check)
. . for-loop: undefined;
cannot reference an identifier before its definition
由于翻译问题，部分题目与原书不符，可以参考译者的勘误
5.20的笔误
chapter_5/exercise_5_20.md
底下的 (const x '()) 应为 (cons x '())
Exercise 1.3. Define a procedure that takes three numbers as arguments and returns the sum of the squares of the two larger numbers.
计算的应该是两个较大的数的平方和。
3.47 b的release有bug
第45行后的
((eq? m 'release)
(if (test-and-set! cell)
(the-semaphore 'release))
(set! n (+ n 1))
(clear! cell))应该改为
((eq? m 'release)
(if (test-and-set! cell)
(the-semaphore 'release)
(begin
(set! n (+ n 1))
(clear! cell))))否则当锁住时调用release会不断累积 (set! n (+ n 1)) 和 (clear! cell) 的调用，在解锁后导致n不正确
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