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# Calculator Documentation

### Step 3

This is step 3 of the calculator project in Exploration 68 of Exploring C++: The Programmer's Introduction to C++.

This version of the calculator implements simple arithmetic. It uses a recursive-descent parser to build a parse tree. Then it evaluates the parse tree and prints the result.

The node.hpp file declares the parse tree node class, which uses the pimpl idiom to wrap a pointer to a node_impl object. The node_impl class is the root of the parse tree classes.