A.forname[inword];dolist;done
B.for((expr1;expr2;expr3));dolist;done
C.while[expr]dolist;done
D.dolist;while[expr]
8.给定以下文法 factor → digit | (expr ) term → term × factor | term / factor | factor expr → expr + term | expr – term | termdigit → 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 (1)构建以下表达式的语法树 (a)1+2-3 (b)1+2×3/4 (2)添加(a)的语法树的属性值(term.t=…) (3)添加(a)的语义动作(print …)
A.group by (expr1, expr2)
B.group by (expr), (expr2)
C.group by (expr1, expr2),expr3
D.group by expr1, expr2,expr3
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