以文本方式查看主题

-  Foxtable(狐表)  (http://foxtable.net/bbs/index.asp)
--  专家坐堂  (http://foxtable.net/bbs/list.asp?boardid=2)
----  [求助]浮点数表示方法  (http://foxtable.net/bbs/dispbbs.asp?boardid=2&id=77571)
--  作者：jspta
--  发布时间：2015/11/20 16:09:00
--  [求助]浮点数表示方法
求指导，1,0.5,1.5的二进制是怎么换算得出的。。完全看不明白。。

4-byte real:
SEEEEEEE MMMMMMMM MMMMMMMM MMMMMMMM
8-byte real:
SEEEEEEE MMMMMMMM MMMMMMMM MMMMMMMM
MMMMMMMM MMMMMMMM MMMMMMMM MMMMMMMM

Examples of 4-byte real:
Note: In the first six lines of the following example, the 7-bit
exponent field = 65. The actual exponent is 65-64=1.

01000001 00010000 00000000 00000000 = 1
01000001 00100000 00000000 00000000 = 2
01000001 00110000 00000000 00000000 = 3
11000001 00010000 00000000 00000000 = -1
11000001 00100000 00000000 00000000 = -2
11000001 00110000 00000000 00000000 = -3

01000000 10000000 00000000 00000000 = .5
01000000 10011001 10011001 10011001 = .6
01000000 10110011 00110011 00110011 = .1
01000001 00011000 00000000 00000000 = 1.5
01000001 00011001 10011001 10011001 = 1.6
01000001 00011011 00110011 00110011 = 1.1

00000000 00000000 00000000 00000000 = 0
01000001 00010000 00000000 00000000 = 1
01000001 10100000 00000000 00000000 = 10
01000010 01100100 00000000 00000000 = 100
01000011 00111110 10000000 00000000 = 1000
01000100 00100111 00010000 00000000 = 10000
01000101 00011000 01101010 00000000 = 100000
--  作者：大红袍
--  发布时间：2015/11/20 16:32:00
--  

1、http://www.cnblogs.com/zhangziqiu/archive/2011/03/30/ComputerCode.html

 

2、http://www.cnblogs.com/xkfz007/articles/2590472.html

 

3、http://www.baidu.com/baidu?wd=%B8%A1%B5%E3%CA%FD%D7%AA%B6%FE%BD%F8%D6%C6&tn=monline_4_dg