Question

Define Context-free grammar

Matching syntactic entities (e.g., parentheses, brackets, or braces) is an important aspect of many programming languages. Define a context-free grammar in BNF capable of generating only balanced strings of (nested or flat) matched parentheses. The empty string is not in this language.

For instance, the strings (), ()(), (()), (()())(), and ((()())()) are sentences in this language, while the strings )(, )(), )()(, (()(), ())((, and ((()()) are not. Note that not all strings with the same number of open and close parentheses are in this language (e.g., the strings )( and )()( are not sentences in this language).

Answer 1

e does ht belong to LanguageL s(S)]ss matched paranthests S C , CF6) Start symblgenerat single par 1 ?)It Nested Paanthers ((())) must produce Ex: S (s) 7 (Co)) fo lto 3)+ must produca Nested pranthers foltowed by vanthens m u so duc P aranthests → (S) S ーク(1))() All possible matched Parenthess can be enerated by the above CF6

BNF 12 K S S