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Line 250:
Line 250: + + +
→Level 2: context-free grammar: add some discussion
-> '''2''' '''*''' '''3''' ''AddSubOp'' ''Primary''
-> '''2''' '''*''' '''3''' ''AddSubOp'' ''Primary''
-> '''2''' '''*''' '''3''' '''+''' '''4'''
-> '''2''' '''*''' '''3''' '''+''' '''4'''
====Discussion====
Context-free grammars (or an equivalent definition using Backus-Naur-Form) are widely used both to define the syntax of programming languages and to (semi-automatically) generate parsers for these languages.
===Level 1===
===Level 1===