Question

Difference between terminals and nonterminals in language processors

Answer 1

computer science, terminal and nonterminal symbols are the lexical elements used in specifying the production rules constituting a formal grammar. Terminal symbols are the elementary symbols of the language defined by a formal grammar. Nonterminal symbols (or syntactic variables) are replaced by groups of terminal symbols according to the production rules.

The terminals and nonterminals of a particular grammar are two disjoint sets