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210403197711070024

0551-2872055

1 2 3

1.2.1 二进制代码的特征

• 有十个基本数字，0-9
• 采用逢十进一的进位规则
• 每个数码在不同的位数上对应不同的权值

• 有二个基本数字，0、1
• 采用逢二进一的进位规则
• 每个数码在不同的位数上对应不同的权值

2

1

0

101=1X2 +0X2 +1X2

?

6X101+5X100

（10110）2=16+4+2=（22）10

• ASCII码是1011000B,对应的字符是什么?

X

• 本节课主要知识点：
• 信息编码的意义。
• 二进制代码的特征。
• 字符编码。