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This example is found in the C++ Annotations, available from
http://www.icce.rug.nl/documents/
The example defines a calculator accepting mixed-expressions (int and double
operands). It focuses on the mixed-type operands, and converts the expressions
to Reversed Polish Notation (HP-calculator type) expressions. Only the +, the
*, the unary - and nested expressions are implemented.
Expression values are printed as cut-off integral values. Internally,
double-arithmetic is used.
Enter one expression per line.
Error recovery is provided by skipping all information on one line when a
syntax error is encountered.
Enter an empty line to terminate the program.
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