The Parser is a central part of a compiler.

• The input to the parser is the output of the lexical analyzer ( gettoken).

• The parser analyzes whole statements of the program:
  if expression then statement else statement

• Since the language constructs may be recursive, a context-free grammar must be used.

• The parser builds complex tables, such as the symbol table, in response to declaration statements. These tables are used later in the generation of code.

• The output of the parser is intermediate code.

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