考虑以下翻译方案。
S → ER
R → *E{print(“*”);}R | ε
E → F + E {print(“+”);} | F
F → (S) | id {打印(id.value)；}
这里id是一个token，代表一个整数，id.value代表对应的整数值。对于输入’2 * 3 + 4’，这个翻译方案打印
(一) 2*3+4
(B) 2 * +3 4
(C) 2 3 * 4 +
(D) 2 3 4+*答案： (D)
说明：解决问题所需的背景知识 – 语法定向翻译和
解析树构建。
Explanation : We are given L-Attributed Syntax Directed Translation as
semantic actions like printf statements are inserted anywhere on the
RHS of production (R → *E{print(“*”);}R). After constructing the parse tree
as shown below from the given grammar, we will follow depth first order left
to right evaluation in order to generate the final output.
解析树： 
Just follow the arrows in the picture (This is actually Depth first
left to right evaluation ) and the moment we take exit from any child
which is printf statement in this question, we print that symbol which
can be a integer value or ‘*’ or ‘+’.
评估 ： 
此解释由Pranjul Ahuja 提供。
这个问题的测验