这是编译原理的源代码，涉及了编译原理的各个过程：词法分析，LL1语法分析，语义分析，中间代码生成，中间代码优化,中间代码生成目标代码，目标代码的解释执行-This is the principle of compiling source code, the various principles involved in the compilation process: lexical analysis, LL1 parsing, semantic analysis, intermediate co

词法分析器，简单的词法规则，程序以“空格+#”表示结束。-Lexical analyzer, a simple lexical rules, procedures to " space+#" indicates the end.