Example
The following is a simple Context-free grammar which can describe a language made up of multiplication and addition of integers.
Expr → Expr + Term Expr → Term Term → Term * Factor Term → Factor Factor → "(" Expr ")" Factor → integer
The following attribute grammar can be used to calculate the result of an expression written in the grammar. Note that this grammar only uses synthesized values, and is therefore an S-attributed grammar.
Expr1 → Expr2 + Term Expr → Term Term1 → Term2 * Factor Term → Factor Factor → "(" Expr ")" Factor → integer
Read more about this topic: Attribute Grammar
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