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The document discusses symbol tables, which are key-value pair abstractions used for data storage and retrieval. It covers various implementations, including unordered arrays, ordered arrays, and linked lists, along with their respective APIs and functionalities such as insertion, searching, and iteration. The document also highlights applications of symbol tables in real-world scenarios like DNS lookups, phone books, and frequency counts. Additionally, it addresses challenges related to key comparisons and performance benchmarks for different implementations.

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What is the difference between symbol table and Hashtable?

A symbol table must be organised in such a way that entries can be found as quickly as possible. Hash tables are usually used to organise a symbol table, where the keyword or identifier is hashed to produce an array subscript.

What is the basic symbol table?

A symbol table is a data type that we use to associate values with keys. Clients can store (put) an entry into the symbol table by specifying a key-value pair and then can retrieve (get) the value corresponding to a particular key from the symbol table.

What are the symbol tables storage data structures used?

There are three data structures used to implement symbol table: 1. Linear list 2. Binary tree 3. Hash table 1.

What are symbol tables used for?

The symbol table is used to store essential information about every symbol contained within the program. Virtually every phase of the compiler will use the symbol table: The initialization phase will place keywords, operators, and standard identifiers in it.

What is the role of symbol table in parsing?

Usually, the symbol table does not include all strings of the source code. Instead, the symbol table represents the static environment of a program, i.e. the visible variables and possibly their types. During parsing and compilation, the current state of the symbol table indicates which variables are visible.

What are symbol tables in semantic analysis?

The symbol table records information about each symbol name in a program. Historically, names were called symbols, and hence we talk about a symbol table rather than a name table. In this module, the word symbol will mean name.

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