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相关概念<br />
字母表:一个有限的符号集合<br />
二进制{0,1}<br />
ASCII<br />
Unicode<br />
典型的字母表包括字母、数位和标点符号<br />
串:字母表中符号组成的一个有穷序列<br />
串s的长度 |s|<br />
空串ε,长度为0的串<br />
语言:给定字母表上一个任意的可数的串的集合<br />
语法正确的C程序的集合,英语,汉语
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