YACC-BISON：
G(E):
E->E + T | T
T->T*F | F
F->(E) | digit
Construct a parser for grammar E by YACC-BISON, compute the
value,and print the result.
Design the attribute grammar: + and * operator can only
be used for integers,else errors should be reported.
YACC-BISON： G(E): E->E + T | T T->T*F | F F->(E) | digit Construct a parser for grammar E by YACC-BISON, compute the va
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YACC-BISON： G(E): E->E + T | T T->T*F | F F->(E) | digit Construct a parser for grammar E by YACC-BISON, compute the va
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