在《Programming abstractions in C》p111-p113中，如何将boilerplate代码改写为长尾？
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本文共计728个文字，预计阅读时间需要3分钟。
《C语言编程抽象》学习第47天，p111-p113总结如下：
1.技术总结：模板
. boilerplate /* File: random.h Version: 1.0 Last modified on Fri Jul 22 16:44:36 1994 by eroberts ----------------------------------- */《Programming Abstractions In C》学习第47天，p111-p113，总结如下：
一、技术总结 1.boilerplate
/*
* File: random.h
* Version: 1.0
* Last modified on Fri Jul 22 16:44:36 1994 by eroberts
* -----------------------------------------------------
* This interface provides several functions for generating
* pseudo-random numbers.
*/
#ifndef _random_h
#define _random_h
#include "genlib.h"
#include <stdlib.h>
/*
* Constant: RAND_MAX
* ------------------
* Unfortunately, several libraries that supposedly conform to
* the ANSI standard do not define RAND_MAX in <stdlib.h>. To
* reduce portability problems, this interface defines RAND_MAX
* to be the largest positive integer if it is undefined.
*/
#ifndef RAND_MAX
# define RAND_MAX ((int) ((unsigned) ~0 >> 1))
#endif
/*
* Function: Randomize
* Usage: Randomize();
* -------------------
* This function sets the random seed so that the random sequence
* is unpredictable. During the debugging phase, it is best not
* to call this function, so that program behavior is repeatable.
*/
void Randomize(void);
/*
* Function: RandomInteger
* Usage: n = RandomInteger(low, high);
* ------------------------------------
* This function returns a random integer in the range low to high,
* inclusive.
*/
int RandomInteger(int low, int high);
/*
* Function: RandomReal
* Usage: d = RandomReal(low, high);
* ---------------------------------
* This function returns a random real number in the half-open
* interval [low .. high), meaning that the result is always
* greater than or equal to low but strictly less than high.
*/
double RandomReal(double low, double high);
/*
* Function: RandomChance
* Usage: if (RandomChance(p)) . . .
* ---------------------------------
* The RandomChance function returns TRUE with the probability
* indicated by p, which should be a floating-point number between
* 0 (meaning never) and 1 (meaning always). For example, calling
* RandomChance(.30) returns TRUE 30 percent of the time.
*/
bool RandomChance(double p);
#endif
p113，These three lines are often referred to as interface boilerplate。boilerplate这个词会在计算机相关的教材中会经常看到，英文的意思是：“text that can be copied and used in computer program，with only small changes.”(模板)，之所以叫模板，是因为在每个头文件中都有这三句。这个单词不难理解，关键是通过此次的教材对这个单词有一个具体的、形象的记录，当提到这个单词，就知道具体指的是什么。
二、英语总结
1.roll a die一句里面的die是什么意思？ 答：die: n.a small cube with a different number of spots on each side.(骰子)，所以roll a die的就是"掷骰子"。
2.along with语法
答：along with在表示伴随、以及或连同等意思时，两者之间无先后顺序，可能在前也可能在后。这点与follow不同。示例：For each of these functions, the interface contains one-line prototype along with a comment that describe the purpose of the function from the perspective of clients.
3.up to 语法 答：原文：The line:
#ifndef _random_h
cause the compiler to skip any text up to the #endif line if the the symbol _random_h has been previously defined。
up to短语主要有两种用法：
(1)adv. used to say that sth is less than or equal to but not more than a stated value。
(2)adv. until。
都表示的是“程度”，而不是“方向”。
三、参考资料
1.编程
1)Eric S.Roberts，《Programming Abstractions in C》：book.douban.com/subject/2003414
2.英语
1)Etymology Dictionary：www.etymonline.com
2)Cambridage Dictionary：dictionary.cambridge.org
欢迎搜索及关注：编程人(a_codists)
本文共计728个文字，预计阅读时间需要3分钟。
《C语言编程抽象》学习第47天，p111-p113总结如下：
1.技术总结：模板
. boilerplate /* File: random.h Version: 1.0 Last modified on Fri Jul 22 16:44:36 1994 by eroberts ----------------------------------- */《Programming Abstractions In C》学习第47天，p111-p113，总结如下：
一、技术总结 1.boilerplate
/*
* File: random.h
* Version: 1.0
* Last modified on Fri Jul 22 16:44:36 1994 by eroberts
* -----------------------------------------------------
* This interface provides several functions for generating
* pseudo-random numbers.
*/
#ifndef _random_h
#define _random_h
#include "genlib.h"
#include <stdlib.h>
/*
* Constant: RAND_MAX
* ------------------
* Unfortunately, several libraries that supposedly conform to
* the ANSI standard do not define RAND_MAX in <stdlib.h>. To
* reduce portability problems, this interface defines RAND_MAX
* to be the largest positive integer if it is undefined.
*/
#ifndef RAND_MAX
# define RAND_MAX ((int) ((unsigned) ~0 >> 1))
#endif
/*
* Function: Randomize
* Usage: Randomize();
* -------------------
* This function sets the random seed so that the random sequence
* is unpredictable. During the debugging phase, it is best not
* to call this function, so that program behavior is repeatable.
*/
void Randomize(void);
/*
* Function: RandomInteger
* Usage: n = RandomInteger(low, high);
* ------------------------------------
* This function returns a random integer in the range low to high,
* inclusive.
*/
int RandomInteger(int low, int high);
/*
* Function: RandomReal
* Usage: d = RandomReal(low, high);
* ---------------------------------
* This function returns a random real number in the half-open
* interval [low .. high), meaning that the result is always
* greater than or equal to low but strictly less than high.
*/
double RandomReal(double low, double high);
/*
* Function: RandomChance
* Usage: if (RandomChance(p)) . . .
* ---------------------------------
* The RandomChance function returns TRUE with the probability
* indicated by p, which should be a floating-point number between
* 0 (meaning never) and 1 (meaning always). For example, calling
* RandomChance(.30) returns TRUE 30 percent of the time.
*/
bool RandomChance(double p);
#endif
p113，These three lines are often referred to as interface boilerplate。boilerplate这个词会在计算机相关的教材中会经常看到，英文的意思是：“text that can be copied and used in computer program，with only small changes.”(模板)，之所以叫模板，是因为在每个头文件中都有这三句。这个单词不难理解，关键是通过此次的教材对这个单词有一个具体的、形象的记录，当提到这个单词，就知道具体指的是什么。
二、英语总结
1.roll a die一句里面的die是什么意思？ 答：die: n.a small cube with a different number of spots on each side.(骰子)，所以roll a die的就是"掷骰子"。
2.along with语法
答：along with在表示伴随、以及或连同等意思时，两者之间无先后顺序，可能在前也可能在后。这点与follow不同。示例：For each of these functions, the interface contains one-line prototype along with a comment that describe the purpose of the function from the perspective of clients.
3.up to 语法 答：原文：The line:
#ifndef _random_h
cause the compiler to skip any text up to the #endif line if the the symbol _random_h has been previously defined。
up to短语主要有两种用法：
(1)adv. used to say that sth is less than or equal to but not more than a stated value。
(2)adv. until。
都表示的是“程度”，而不是“方向”。
三、参考资料
1.编程
1)Eric S.Roberts，《Programming Abstractions in C》：book.douban.com/subject/2003414
2.英语
1)Etymology Dictionary：www.etymonline.com
2)Cambridage Dictionary：dictionary.cambridge.org
欢迎搜索及关注：编程人(a_codists)