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操作系统及SDK操作系统如果打算开发Windows App，那么你的电脑就不能再用老旧的Windows 7了。推荐使用Windows 8.1。写这篇博客的时候，我用的操作系统是Windows 10 Pro Technical Preview [Build 10041].操作系统除了在... 阅读全文
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练习4-3原文Exercise 4.3. Rewrite eval so that the dispatch is done in data-directed style. Compare this with the datadirected differentiation pro... 阅读全文
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练习4-2原文Exercise 4.2. Louis Reasoner plans to reorder the cond clauses in eval so that the clause for procedure applications appears before th... 阅读全文
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练习4-1原文Exercise 4.1. Notice that we cannot tell whether the metacircular evaluator evaluates operands from left to right or from right to lef... 阅读全文
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练习3-82原文Exercise 3.82. Redo exercise 3.5 on Monte Carlo integration in terms of streams. The stream version of estimate-integral will not hav... 阅读全文
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练习3-81原文Exercise 3.81. Exercise 3.6 discussed generalizing the random-number generator to allow one to reset the random-number sequence so as... 阅读全文
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练习3-77原文Exercise 3.77. The integral procedure used above was analogous to the “implicit” definition of the infinite stream of integers in sec... 阅读全文
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练习3-72原文Exercise 3.72. In a similar way to exercise 3.71 generate a stream of all numbers that can be written as the sum of two squares in th... 阅读全文
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练习3-71原文代码(define (Ramanujan s) (define (stream-cadr s) (stream-car (stream-cdr s))) (define (stream-cddr s) (stream-cdr (stre... 阅读全文
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练习3-70原文代码(define (merge-weighted s1 s2 weight) (cond ((stream-null? s1) s2) ((stream-null? s2) s1) (else (let ((cars1 (stream-car ... 阅读全文
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练习3-69原文代码(define (triples s t u) (cons-stream (list (stream-car s) (stream-car t) (stream-car u)) (interleave... 阅读全文
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练习3-68原文Exercise 3.68. Louis Reasoner thinks that building a stream of pairs from three parts is unnecessarily complicated. Instead of separa... 阅读全文
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练习3-67原文Exercise 3.67. Modify the pairs procedure so that (pairs integers integers) will produce the stream of all pairs of integers (i,j) (w... 阅读全文
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练习3-66原文Exercise 3.66. Examine the stream (pairs integers integers). Can you make any general comments about the order in which the pairs are... 阅读全文