August 2017
Intermediate to advanced
360 pages
8h 35m
Chinese
Content preview from 算法技术手册（原书第2 版）
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算法基础
｜
41
算法基础
3.88
f
后面接下来三个连续的
32
位浮点表示是：
•
0x407851ed: 3.8800004
•
0x407851ee: 3.8800006
•
0x407851ef: 3.8800008
随机选择三个
32
位的单精度浮点数，表示为：
•
0x1aec9fae: 9.786529E-23
•
0x622be970: 7.9280355E20
•
0x18a4775b: 4.2513525E-24
在
32
位浮点数中，
1
位用于表示符号，
8
位用于表示指数，
23
位用于表示尾数（也就
是
有效数
）。在
Java
的浮点表示中，“将指数部分作为一个正数，然后从这个正数中
减去一个基准值，得到
2
的幂。对于一个浮点数来说，这个基准值是
126
”（
Venners
，
1996
）。如果指数部分是
128
，那么实际的指数值是
128-126
，即为
2
。
为了得到最高的精确度，尾数必须是标准化的，因此最左边的数字永远是
1
。虽然
并不需要每次都物理上存储
这一位，但是浮点数处理器必须要遵守这条标准：那
就是左边永远应该是
1
，并且在需要的时候补上这一位。在之前的例子中，尾数
是
.[1]11110000101000111101100
= [1/2] + 1/4 + 1/8 + 1/16 + 1/32 + 1/1024 + 1/4096 +
1/65 536 + 1/131 072 + 1/262 144 + 1/524 288 + 1/2 097 152 + 1/4 194 304
，四舍五入之
后，这个和是 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.