So, until now, we have seen some grammars and we have given some parsers for those grammars. However, in practice, when we design a compiler, we need to not only use grammars but also associate them with informal notations called semantic rules. These semantic rules, along with the grammars, make up the high-level design of the compiler. In the compiler design, we not only use plain grammars, but we also use meaningful rules that help with syntax analysis, code generation, symbol table manipulation, and expression evaluation. These actions that are associated with the grammar are called semantic actions. For example, let's consider the expression "2 plus 3 times 4". If we want to evaluate this expression, the answer should be 14. To achieve this, we can use a syntax-directed translation (SDT). First, we need to construct the parse tree, which is done by applying the production rules from the grammar. Let's write out the derivation steps to construct the parse tree: E -> E + T E -> T T -> T * F T -> F F -> number In this case, the numbers 2, 3, and 4 are the lexical values for the tokens. Once we have the parse tree, we can traverse it in a top-down, left-to-right manner. Whenever there is a reduction, we go to the corresponding production and the associated action. Note: The text provided has minor errors and inconsistencies, such as capitalization and missing punctuations. These mistakes have been corrected in this response.
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Dependency statement definition Form: What You Should Know
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