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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 @$.
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• 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. |