《Programming Abstractions in C》学习第 48 天，p114-p117，总结如下：
一、技术总结
次要通过 random number 介绍了随机数的相干用法，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。当探讨波及到范畴时，咱们常常会说在某两个数之间，如果蕴含这两个数，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 也能够用作 adjective。subject to sth：only able to happen if sth else happen。
三、数学总结
1. 区间相干概念
(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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