Rewrite the attribute grammar of Figure 4.14 in the form of an ad hoc tree traversal consisting of mutually recursive subroutines in your favorite programming language. Keep the symbol table in a global variable, rather than passing it through arguments.

Figure 4.14:

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Attributes Class of node Variants Inherited Synthesized location, errors program item int decl, real_decl, read, write, :=, null int_const, real_const, id, +, -, X, ÷, symtab, errors.in location, errors.out location, type, errors, name (id only) еxpr symtab float, trunc