Question: The get_value(), set_value(), is_declared(), and define_name() functions all operate on the variable var_table. Define a class called Symbol_table with a member var_table of type vector

The get_value(), set_value(), is_declared(), and define_name() functions all operate on the variable var_table. Define a class called Symbol_table with a member var_table of type vector and member functions get(), set(), is_declared(), and declare(). Rewrite the calculator to use a variable of type Symbol_table.

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