输入输出语句： S →Write(E) E.tuple (WRITE, E.Arg); S → Read(V) V.tuple （READ, V.Arg） 语法制导： S → Read(V) #READ S → Write(E) #WRITE

一、开始符产生式的右部是归约活前缀。 二、如果A是归约活前缀，且A→是产生式，则也是归约活前缀

7.1 概述 7.2 函数的定义与调用 7.3 数组作函数参数 7.4 函数的嵌套调用和递归调用 7.5 局部变量和全局变量及其作用域 7.6 变量的存储类别及变量的生存期 7.7 函数的存储分类 7.8 编译预处理 7.9 多文件程序的调试方法

5.1函数应用的C程序实例 5.2函数的定义 5.3函数调用 5.4函数的嵌套调用和递归调用 5.5内联函数和重载函数 5.6作用域 5.7变量及函数的存储类型 5.8编译预处理

1排版 2注释 3标识符命名 4可读性 5变量、结构 6函数、过程 7可测性 8程序效率 9质量保证 10代码编辑、编译、审查 11代码测试、维护 12宏

Generate executable code for a target machine that is a faithful representation of the semantics of the source code Depends not only on the characteristics of the source language but also on detailed information about the target architecture, the structure of the runtime environment, and the operating system running on the target machine

Assuming two bytes for integers, four bytes for addresses, one byte for character and eight bytes for double-precision floating point, we would have the following offset values:

SLR(1), called simple LR(1) parsing, uses the DFA of sets of LR(0) items as constructed in the previous section SLR(1) increases the power of LR(0) parsing significant by using the next token in the input string – First, it consults the input token before a shift to make sure that an appropriate DFA transition exists

Main idea LL(1) Parsing uses an explicit stack rather than recursive calls to perform a parse An example: – a simple grammar for the strings of balanced parentheses: S→(S) S∣ε The following table shows the actions of a top￾down parser given this grammar and the string ( )

The memory of a typical computer: A register area; Addressable Random access memory (RAM): A code area; A data area. The code area is fixed prior to execution, and can be visualized as follows: