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《Programming Abstractions in C》学习第48天，p114-p117，​总结如下：

一、技术总结
主要通过random number介绍了随机数的相关用法，interface​示例(random.h)​，client program示例(craps.c)。

#include <stdio.h>
#include "genlib.h"
#include "random.h"static bool TryToMakePoint(int point);
static int RollTwoDice(void);void main() {int point;Randomize();  // 定义在自定义的random.h文件中printf("This program plays a game of craps.\n");point = RollTwoDice();switch (point) {case 7: case 11:printf("That's a natural. You win.\n");break;case 2: case 3: case 12:printf("That's craps. You lose.\n");break;default:printf("Your point is %d.\n", point);if (TryToMakePoint(point)) {printf("You made your point. You win.\n");} else {printf("You rolled a seven. You lose.\n");}}
}static bool TryToMakePoint(int point) {int total;while (TRUE) {total = RollTwoDice();if (total == point) return TRUE;if (total == 7) return FALSE;}
}static int RollTwoDice(void) {int d1, d2, total;printf("Rolling the dice ...\n");d1 = RandomInteger(1, 6);  // 定义在自定义的random.h文件中d2 = RandomInteger(1, 6);total = d1 + d2;printf("You rolled %d and %d -- that's %d.\n", d1, d2, total);return total;
}

二、英语总结
1.inclusive什么意思？
答：adj. including a particular thing。当讨论涉及到范围时，我们经常会说在某两个数之间，如果包含这两个数，那么就用inclusive这个词来形容这两个数。示例：p114，The first prototype is for the function RandomInteger(low, high), which return a randomly chosen integer in the range between low and high, inclusive。

2.subject to sth语法
答：subject用法最常见的是用作noun，不过subject也可以用作adjective。subject to sth：only able to happen if sth else happen。

三、数学总结
1.区间相关概念
(1) 半开区间: half-open internal
(2) open circle：open circle
(3) 方括号：square bracket

三、参考资料
1.编程
(1)Eric S.Roberts，《Programming Abstractions in C》​：https://book.douban.com/subject/2003414

2.英语
(1)Etymology Dictionary：https://www.etymonline.com
(2)Cambridage Dictionary：https://dictionary.cambridge.org

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