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Now we show and explain several sample programs written using Bison: a Reverse Polish Notation calculator, an algebraic (infix) notation calculator — later extended to track “locations” — and a multi-function calculator. All produce usable, though limited, interactive desk-top calculators.
These examples are simple, but Bison grammars for real programming languages are written the same way. You can copy these examples into a source file to try them.
| • RPN Calc | Reverse Polish Notation Calculator; a first example with no operator precedence. | |
| • Infix Calc | Infix (algebraic) notation calculator. Operator precedence is introduced. | |
| • Simple Error Recovery | Continuing after syntax errors. | |
| • Location Tracking Calc | Demonstrating the use of @n and @$. | |
| • Multi-function Calc | Calculator with memory and trig functions. It uses multiple data-types for semantic values. | |
| • Exercises | Ideas for improving the multi-function calculator. |