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https://zh.wikipedia.org/wiki/%E9%80%92%E5%BD%92递归（英语：Recursion），又译为递回，在数学与计算机科学中，是指在函数的定义中使用函数自身的方法。递归一词还较常用于描述以自相似方法重复事物的过程。例如，当两面镜子相互之间近似平行时，镜中嵌套的图像是以无限递归的形式出现的。语言例子从前有座山，山里有座庙，庙里有个老和尚，正在给小和尚讲故事呢！故事是什么呢？“从前有座山，山里有座庙，庙里有个老和尚，正在给小和尚讲故事呢！故事是什么呢？‘从前有座山，山里有座庙，庙里有个老和尚，正在给小和尚讲故事呢！故事是什么呢？……’”以下是另一个可能更有利于 阅读全文
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http://c2.com/cgi/wiki?TailRecursionRecursive procedures call themselves to work towards a solution to a problem. In simple implementations this balloons the stack as the nesting gets deeper and deeper, reaches the solution, then returns through all of the stack frames. This waste is a common compla 阅读全文
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loop [lu:p]、iterate ['itəreit]、traversal [træ'vɜ:sl]和recursion [rɪˈkɜ:ʃn]分别翻译为：循环、迭代、遍历和递归。循环是计算机科学运算领域的用语，也是一种常见的控制流程。循环是一段在程序中只出现一次，但可能会连续运行多次的代码。循环中的代码会运行特定的次数，或者是运行到特定条件成立时退出循环，或者是针对某一集合中的所有项目都运行一次。在计算机科学中，For循环（英语：For loop）是一种编程语言的迭代陈述，能够让程式码反复的执行。它跟其他的循环，如while循环，最大的不同，是它拥有一个循环计数器 阅读全文
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http://stackoverflow.com/questions/6707148/foreach-macro-on-macros-arguments/13459454#13459454recursive macros are possible in C using a fancy workaround. The end goal is to create aMAPmacro which works like this:#define PRINT(a) printf(#a": %d", a)MAP(PRINT, a, b, c) /* Apply PRINT to a, 阅读全文
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http://aggregate.org/MAGIC/The Aggregate Magic AlgorithmsThere are lots of people and places that create and collect algorithms of all types (hereare a few WWW sites). Unfortunately, in building systems hardware and software, we inThe Aggregateoften have found it necessary to do relatively obscure l 阅读全文
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http://www.hackersdelight.org/hdcodetxt/nlz.c.txt// This has the programs for computing the number of leading zeros// in a word.// Max line length is 57, to fit in hacker.book.// Compile with g++, not gcc.#include <stdio.h>#include <stdlib.h> // To define "exit", req'd by X 阅读全文
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http://graphics.stanford.edu/~seander/bithacks.htmlBit Twiddling HacksBy Sean Eron Andersonseander@cs.stanford.eduIndividually, thecode snippets here are in the public domain(unless otherwise noted) — feel free to use them however you please. The aggregate collection and descriptions are ©1997- 阅读全文