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Semantic Values (Bison 3.8.1)

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Semantic Values (Bison 3.8.1)

Semantic Values (Bison 3.8.1) Next: Semantic Actions , Previous: From Formal Rules to Bison Input , Up: The Concepts of Bison [ Contents ][ Index ] 1.3 Semantic Values A formal grammar selects tokens only by their classifications: for example, if a rule mentions the terminal symbol 'integer constant', it means that any integer constant is grammatically valid in that position. The precise value of the constant is irrelevant to how to parse the input: if ' x+4 ' is grammatical then ' x+1 ' or ' x+3989 ' is equally grammatical. But the precise value is very important for what the input means once

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