Question

What are the advantages and disadvantages of defining the keyword and symbol tables in the scanner or the parser?

Answer 1

Ans. Advantages and disadvantages of defining symbol table in the scanner or parser:

Advantages:

1. The symbol table makes it easier to quickly search the identifier record and retrieve it.

2. The symbol table used to verify that used identifiers have been defined .

3. The symbol table is used to implement type checking by verifying expressions and assignments are semantically correct .

4. It is used to store the name of all entities in a structural form at one place.

Disadvantages:

1. It doesn't perform the processing of the assembler directives.

2. Hashing is complicated to implement in symbol table.

Advantages and disadvantages of defining keyword ìn scanner and parser:

keyword uses as a token, the pattern is a sequence of characters used in the scanner or parser.