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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:
Infix (algebraic) notation calculator. Operator precedence is introduced. 2.3 Simple Error Recovery Continuing after syntax errors. 2.4 Location Tracking Calculator:
Demonstrating the use of @n and @$. 2.5 Multi-Function Calculator:
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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