Search - string类的方法

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[ELanguage] 1 DL : 0: 语法分析是编译程序的核心部分。语法分析的作用是识别由词法分析给出的单词符号序列是否是给定的文法的正确句子。目前语法分析常用的方法右自顶向下分析和自底向上分析两大类。确定的自顶向下方法，是从文法的开始符号，考虑如何根据当前的输入符号（单词）唯一的确定选用哪个产生式替换相应非终结符往下推导。 LL(1)文法是一种确定的自顶向下的分析方法。 LL(1)的含义是：第一个L表明自顶向下分析从左向右扫描输入串，第二个L表明分析过程中将用最左推导，1表明只需向右看一个符号便可以决定如何推导即选择哪个产生式（即规则）进行推导。-Syntax analysis is the core of the compiler. The role of grammatical analysis is to identify the word given by the lexical analysis of whether a given sequence of symbols of the grammar correct sentences. At present the right syntax analysis method commonly used top-down analysis and bottom-up analysis of two categories. Determined by top-down approach, starting from the grammar symbols, consider how the current input symbol (word) only determine the choice of productions which replace the corresponding non-terminal symbol derived down. LL (1) grammar is a sure top-down analysis. LL (1) the meaning is: the first one shows that top-down analysis of L from left to right scanning input string, the second L showed that the analysis process will be the most left-derivation, a show that just the right look can be a symbol deduced that the choice to decide how to produce what type (ie, rules) for derivation.
Date : 2026-01-01 Size : 3.87mb User : 孔小亮
[ELanguage] assembler DL : 0: 该程序使用了I/O流对存有汇编语言文本进行读入以及对操作结果的文本输出；运用了数据结构的栈结构，简化了文本内容的识别；将文本中的一行封装成类对象hang；将系统的一些操作指令通过哈希结构封装在symtab类中；将文本获得的操作指令封装在optab中；自己还另外编写了十进制转十六进制，int类型和对应的字符串进行互转的方法供程序使用。-The program uses the I/O stream of assembly language there and read the text on the operating results of text output the use of a stack structure of the data structure, simplifying the recognized text content the text line in the package into a class object hang some of the operating system via the hash command structure is encapsulated in symtab class the operating instructions enclosed in optab text obtained and he still write additional decimal turn hex , int type and the corresponding string Huzhuan the method for the program.
Date : 2026-01-01 Size : 1.08mb User : 钟武俊