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Bison 1.875

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2. Examples

Now we show and explain three sample programs written using Bison: a reverse polish notation calculator, an algebraic (infix) notation calculator, and a multi-function calculator. All three have been tested under BSD Unix 4.3; each produces a usable, though limited, interactive desk-top calculator.

These examples are simple, but Bison grammars for real programming languages are written the same way. You can copy these examples out of the Info file and into a source file to try them.

2.1 Reverse Polish Notation Calculator  Reverse polish notation calculator; a first example with no operator precedence.
2.2 Infix Notation Calculator: calc  Infix (algebraic) notation calculator. Operator precedence is introduced.
2.3 Simple Error Recovery  Continuing after syntax errors.
2.4 Location Tracking Calculator: ltcalc  Demonstrating the use of @n and @$.
2.5 Multi-Function Calculator: mfcalc  Calculator with memory and trig functions. It uses multiple data-types for semantic values.
2.6 Exercises  Ideas for improving the multi-function calculator.


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