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<h2 class="chapter">2 Examples</h2>
<p><a name="index-simple-examples-70"></a><a name="index-examples_002c-simple-71"></a>
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.
<p>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.
<ul class="menu">
<li><a accesskey="1" href="RPN-Calc.html#RPN-Calc">RPN Calc</a>: Reverse polish notation calculator;
a first example with no operator precedence.
<li><a accesskey="2" href="Infix-Calc.html#Infix-Calc">Infix Calc</a>: Infix (algebraic) notation calculator.
Operator precedence is introduced.
<li><a accesskey="3" href="Simple-Error-Recovery.html#Simple-Error-Recovery">Simple Error Recovery</a>: Continuing after syntax errors.
<li><a accesskey="4" href="Location-Tracking-Calc.html#Location-Tracking-Calc">Location Tracking Calc</a>: Demonstrating the use of @<var>n</var> and @$.
<li><a accesskey="5" href="Multi_002dfunction-Calc.html#Multi_002dfunction-Calc">Multi-function Calc</a>: Calculator with memory and trig functions.
It uses multiple data-types for semantic values.
<li><a accesskey="6" href="Exercises.html#Exercises">Exercises</a>: Ideas for improving the multi-function calculator.
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