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<title>Gri: programming</title>
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Chapters:
<br>
<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
<a href="InvokingGri.html">3: Invocation</a><br>
<a href="GettingMoreControl.html">4: Finer Control</a><br>
<a href="X-Y.html">5: X-Y Plots</a><br>
<a href="ContourPlots.html">6: Contour Plots</a><br>
<a href="Images.html">7: Image Plots</a><br>
<a href="Examples.html">8: Examples</a><br>
<a href="Commands.html">9: Gri Commands</a><br>
<a href="Programming.html">10: Programming</a><br>
<a href="Environment.html">11: Environment</a><br>
<a href="Emacs.html">12: Emacs Mode</a><br>
<a href="History.html">13: History</a><br>
<a href="Installation.html">14: Installation</a><br>
<a href="Bugs.html">15: Gri Bugs</a><br>
<a href="TestSuite.html">16: Test Suite</a><br>
<a href="GriInThePress.html">17: Gri in Press</a><br>
<a href="Acknowledgments.html">18: Acknowledgments</a><br>
<a href="License.html">19: License</a><br>
<br>
Indices:<br>
<a href="ConceptIndex.html"><i>Concepts</i></a><br>
<a href="CommandIndex.html"><i>Commands</i></a><br>
<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h1>10: Programming in the Gri Language</h1>
The Gri programming language has `<font color="#82140F"><code>if</code></font>' statements to control program
flow, and a `<font color="#82140F"><code>while</code></font>' statement to repeat commands. There are two
data types in Gri: ``variables'' (to store numbers) and ``synonyms'' (to
store character strings). Gri recognizes commands by matching
statements against its list of known commands. This list is extensible;
it is easy to add new commands as extensions to Gri.
<p>
<UL>
<LI><a href="Defaults.html#Defaults">Defaults</a>: How Gri normally acts
<LI><a href="OnlineHelp.html#OnlineHelp">Online Help</a>: Getting help from gri itself
<LI><a href="LongCommandLines.html#LongCommandLines">Long Command Lines</a>: Continued lines
<LI><a href="Variables.html#Variables">Variables</a>: Variables (for storing numbers)
<LI><a href="Synonyms.html#Synonyms">Synonyms</a>: Synonyms (for storing character strings)
<LI><a href="IfStatements.html#IfStatements">If Statements</a>: If statements
<LI><a href="Loops.html#Loops">Loops</a>: Repeating command lines
<LI><a href="Mathematics.html#Mathematics">Mathematics</a>: Doing mathematics on columns, grids etc
<LI><a href="ReversePolishMath.html#rpnMathematics">rpn Mathematics</a>: Doing mathematics on variables
<LI><a href="Text.html#Text">Text</a>: Doing things with characters strings
<LI><a href="NewCommands.html#AddingNewCommands">Adding New Commands</a>: How to customize Gri by adding new commands
<LI><a href="MissingValues.html#MissingValues">Missing Values</a>: How to specify missing data
<LI><a href="Hints.html#Hints">Hints</a>: Hints for good Gri programming
<LI><a href="Debugging.html#Debugging">Debugging</a>: Debugging Gri programs
<LI><a href="ErrorMessages.html#ErrorMessages">Error Messages</a>: What to do about Gri error messages
<LI><a href="MissingValues.html#MissingValues">Missing Values</a>: Missing value code
<LI><a href="OperatingSystem.html#OperatingSystem">Operating System</a>: Using Gri in OS and OS in Gri
<LI><a href="ResourceFile.html#ResourceFile">Resource File</a>: Personalizing Gri
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