Discuss the capabilities of CFG

 The capabilities of CFG : 

Context free grammars are capable of describing most of the syntax of programming language. suitable grammars for expressions can often be constructed using associatively & precedence information. So, context free grammar are most useful in describing nested structures such as balanced parentheses, matching begin-end's, corresponding if-then-else's & so on. These nested structures cannot be described by regular expression. The following grammars the string, which serves the language.

Stat  if cond then stat

        | if cond then stat else stat

        |other -stat.

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