Clearly a bug. Thanks when I have more time I will fix it. I didn't give much thought to operator precedence, I assumed the user would specify it using parenthe

Clearly a bug. Thanks when I have more time I will fix it. I didn't give much thought to operator precedence, I assumed the user would specify it using parentheses. The idea is what is important though. Recursive descent parsing uses the functions that correspond to types in the grammar to mutually call each other thus parsing the expression recursively in a descending fashion.