ASCII 码的规律技巧
字母和数字的 ASCII 码的记忆是非常简单的。 一,首先要观察一下ASCII 码的内在规律。 (1)此表的构造为16行8列。 (2)整张表可以分为两部分:靠近左侧的3列为不常用的,右侧4列为常用的。 (3)英文字母本身只有26个,因此需要在两列展示。 二,对于常用
字母和数字的 ASCII 码的记忆是非常简单的。
一,首先要观察一下ASCII 码的内在规律。
(1)此表的构造为16行8列。
(2)整张表可以分为两部分:靠近左侧的3列为不常用的,右侧4列为常用的。
(3)英文字母本身只有26个,因此需要在两列展示。
二,对于常用的部分,我们只要记住了几个字母或数字 的 ASCII 码:
(1)
A 的 ASCII 码为 65
a 的 ASCII 码为 97
0 的 ASCII 码为 48
(2)或者,记忆 十六进制(H)
1 31
A 41
a 61
以此类推
知道相应的大小 写字母之间差 32 ,就可以推算出其余字母、数字的 ASCII 码。
三, 对于不常用的部分
我们只要简要的记住以下四个就可以了:
二进制(B) 十六进制(H) 十进制(D)
CR 回车键 0000,1101 0D 13
LF 软回车键(用于word文档) 0000,1010 0A 10
ESC 退出键 0001,1011 1B 27
SP 空格键 0010,0000 20 32
虽然标准 ASCII 码是 7 位编码,但由于计算机基本处理单位为字节( 1byte = 8bit ),所以一般仍以一个字节来存放一个 ASCII 字符。每一个字节中多余出 来的一位(最高位)在计算机内部通常保持为 0

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