编译器 词法分析是指原文件被分解为词法符号的过程，通常是整个编译过程的第一步。虽然通常认为了解 C++ 的词法分析过程对于大多数一辈子都不会编写 C++ 编译器的程序员来说意义不大，但这篇文章不仅仅是为了满足某些人的好奇心而写的，因为我觉得任意一个严谨的 C++ 程序员都应该对 C++ 的词法分析有所了解，以避免一些偶然情况下会发生的错误-compiler lexical analysis refers to the original document for lexical symbols decomposition process, the whole is usually the first step in the process of compiling. Although usually understand that the C lexical analysis process for the majority of you will never be prepared C compiler programmer meant little, but this article is not just to satisfy the curiosity of some people wrote, because I think that a rigorous arbitrary C programmers should have the right C lexical analysis have to know and to avoid some of the circumstances that occasionally mistakes happen