1873 lines
49 KiB
HTML
1873 lines
49 KiB
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<!DOCTYPE HTML>
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<meta charset="UTF-8">
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<title>A Little Bit More on Format · Learn Lisp The Hard Way</title>
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<meta name="generator" content="GitBook 3.2.3">
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<meta name="author" content=""the Phoeron" Colin J.E. Lupton">
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<li class="header">LEARN LISP THE HARD WAY</li>
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<li class="chapter " data-level="1.1" data-path="./">
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Second Draft (in-progress)
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<a href="CHANGELOG.html">
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CHANGELOG
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<a href="TODO.html">
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TODO
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</a>
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</li>
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<li class="header">PREFACE</li>
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<li class="chapter " data-level="2.1" data-path="preface.html">
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<a href="preface.html">
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TANSTAAFL
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</a>
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</li>
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<li class="chapter " data-level="2.2" data-path="preface-part-two.html">
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<a href="preface-part-two.html">
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The Hard Way is Easier
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</a>
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</li>
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<li class="chapter " data-level="2.3" data-path="preface-part-three.html">
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<a href="preface-part-three.html">
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Who Is This Book For?
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</a>
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</li>
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<li class="chapter " data-level="2.4" data-path="introduction.html">
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<a href="introduction.html">
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Lisp: A Future History
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</a>
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</li>
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<li class="chapter " data-level="2.5" data-path="acknowledgements.html">
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<a href="acknowledgements.html">
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Acknowledgements
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</a>
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</li>
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<li class="header">PART ONE</li>
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<li class="chapter " data-level="3.1" data-path="1-0-0-overview.html">
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<a href="1-0-0-overview.html">
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Grokking Lisp
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1.1" data-path="1-01-00-lisp-bootcamp.html">
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<a href="1-01-00-lisp-bootcamp.html">
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Common Lisp Bootcamp
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1.1.1" data-path="1-01-01-syntax-overview.html">
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<a href="1-01-01-syntax-overview.html">
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Syntax Overview in 5 Minutes
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.2" data-path="1-01-02-repl.html">
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<a href="1-01-02-repl.html">
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The REPL
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.3" data-path="1-01-03-expressions.html">
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<a href="1-01-03-expressions.html">
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Expressions, Parentheses, and Return Values
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.4" data-path="1-01-04-lists-cons-cells.html">
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<a href="1-01-04-lists-cons-cells.html">
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Lists, Cons-Cells, and Memory
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.5" data-path="1-01-05-symbols.html">
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<a href="1-01-05-symbols.html">
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Symbols and Namespaces
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.6" data-path="1-01-06-prefix-notation.html">
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<a href="1-01-06-prefix-notation.html">
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Prefix Notation
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.7" data-path="1-01-07-style-guide.html">
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<a href="1-01-07-style-guide.html">
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Common Lisp Style Guide
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</a>
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</li>
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<li class="chapter " data-level="3.1.1.8" data-path="1-01-08-configuration.html">
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<a href="1-01-08-configuration.html">
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Configuring Your Development Environment
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.1.2" data-path="1-02-00-input-output.html">
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<a href="1-02-00-input-output.html">
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Printing, Streams, and Strings
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.1.2.1" data-path="1-02-01-strings.html">
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<a href="1-02-01-strings.html">
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Strings
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.2" data-path="1-02-02-more-strings.html">
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<a href="1-02-02-more-strings.html">
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More Strings
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.3" data-path="1-02-03-unicode.html">
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<a href="1-02-03-unicode.html">
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Unicode and Strings
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.4" data-path="1-02-04-chars.html">
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<a href="1-02-04-chars.html">
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Characters
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.5" data-path="1-02-05-more-chars.html">
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<a href="1-02-05-more-chars.html">
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More Characters
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.6" data-path="1-02-06-char-codes.html">
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<a href="1-02-06-char-codes.html">
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Character Codes
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.7" data-path="1-02-07-strings-from-chars.html">
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<a href="1-02-07-strings-from-chars.html">
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Strings from Chars
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.8" data-path="1-02-08-printing.html">
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<a href="1-02-08-printing.html">
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Printing
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.9" data-path="1-02-09-more-printing.html">
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<a href="1-02-09-more-printing.html">
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More Printing
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.10" data-path="1-02-10-prin1.html">
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<a href="1-02-10-prin1.html">
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Printing With prin1
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</a>
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</li>
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<li class="chapter " data-level="3.1.2.11" data-path="1-02-11-princ.html">
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<a href="1-02-11-princ.html">
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Printing With princ
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</a>
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</li>
|
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<li class="chapter " data-level="3.1.2.12" data-path="1-02-12-format.html">
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<a href="1-02-12-format.html">
|
||
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|
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|
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A Brief Introduction to Format
|
||
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</a>
|
||
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</li>
|
||
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<li class="chapter active" data-level="3.1.2.13" data-path="1-02-13-more-format.html">
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||
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|
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<a href="1-02-13-more-format.html">
|
||
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|
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|
||
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A Little Bit More on Format
|
||
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|
||
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</a>
|
||
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|
||
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|
||
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|
||
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</li>
|
||
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<li class="chapter " data-level="3.1.2.14" data-path="1-02-14-pathnames.html">
|
||
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<a href="1-02-14-pathnames.html">
|
||
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Pathnames
|
||
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||
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</a>
|
||
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</li>
|
||
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<li class="chapter " data-level="3.1.2.15" data-path="1-02-15-streams.html">
|
||
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<a href="1-02-15-streams.html">
|
||
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Streams
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</a>
|
||
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</li>
|
||
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<li class="chapter " data-level="3.1.2.16" data-path="1-02-16-file-streams.html">
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||
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<a href="1-02-16-file-streams.html">
|
||
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File Streams
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||
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</a>
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</li>
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||
|
<li class="chapter " data-level="3.1.2.17" data-path="1-02-17-binary-streams.html">
|
||
|
|
||
|
<a href="1-02-17-binary-streams.html">
|
||
|
|
||
|
|
||
|
Binary Streams
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.2.18" data-path="1-02-18-prompting-users.html">
|
||
|
|
||
|
<a href="1-02-18-prompting-users.html">
|
||
|
|
||
|
|
||
|
Prompting Users
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.2.19" data-path="1-02-19-pretty-printing.html">
|
||
|
|
||
|
<a href="1-02-19-pretty-printing.html">
|
||
|
|
||
|
|
||
|
Pretty-Printing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
</ul>
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.3" data-path="1-03-0-getting-input-from-users.html">
|
||
|
|
||
|
<a href="1-03-0-getting-input-from-users.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Getting Input from Users
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.4" data-path="1-04-0-lists.html">
|
||
|
|
||
|
<a href="1-04-0-lists.html">
|
||
|
|
||
|
|
||
|
Lists and List-Operations
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.5" data-path="1-05-0-lookups-trees.html">
|
||
|
|
||
|
<a href="1-05-0-lookups-trees.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Look-up Lists and Trees
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6" data-path="1-06-0-math.html">
|
||
|
|
||
|
<a href="1-06-0-math.html">
|
||
|
|
||
|
|
||
|
Numbers and Math
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
<ul class="articles">
|
||
|
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.1" data-path="1-06-01-integers.html">
|
||
|
|
||
|
<a href="1-06-01-integers.html">
|
||
|
|
||
|
|
||
|
Integers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.2" data-path="1-06-02-more-integers.html">
|
||
|
|
||
|
<a href="1-06-02-more-integers.html">
|
||
|
|
||
|
|
||
|
More Integers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.3" data-path="1-06-03-hexadecimal-notation.html">
|
||
|
|
||
|
<a href="1-06-03-hexadecimal-notation.html">
|
||
|
|
||
|
|
||
|
Hexadecimal Integer Notation
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.4" data-path="1-06-04-octal-notation.html">
|
||
|
|
||
|
<a href="1-06-04-octal-notation.html">
|
||
|
|
||
|
|
||
|
Octal Integer Notation
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.5" data-path="1-06-05-binary-notation.html">
|
||
|
|
||
|
<a href="1-06-05-binary-notation.html">
|
||
|
|
||
|
|
||
|
Binary Integer Notation
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.6" data-path="1-06-06-ratios.html">
|
||
|
|
||
|
<a href="1-06-06-ratios.html">
|
||
|
|
||
|
|
||
|
Ratios and Rational Numbers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.7" data-path="1-06-07-floating-point.html">
|
||
|
|
||
|
<a href="1-06-07-floating-point.html">
|
||
|
|
||
|
|
||
|
Floating-point Numbers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.8" data-path="1-06-08-constants.html">
|
||
|
|
||
|
<a href="1-06-08-constants.html">
|
||
|
|
||
|
|
||
|
Numeric Constants
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.9" data-path="1-06-09-complex-numbers.html">
|
||
|
|
||
|
<a href="1-06-09-complex-numbers.html">
|
||
|
|
||
|
|
||
|
Complex Numbers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.10" data-path="1-06-10-arithmetic.html">
|
||
|
|
||
|
<a href="1-06-10-arithmetic.html">
|
||
|
|
||
|
|
||
|
Arithmetic
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.11" data-path="1-06-11-more-arithmetic.html">
|
||
|
|
||
|
<a href="1-06-11-more-arithmetic.html">
|
||
|
|
||
|
|
||
|
More Arithmetic
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.12" data-path="1-06-12-even-more-arithmetic.html">
|
||
|
|
||
|
<a href="1-06-12-even-more-arithmetic.html">
|
||
|
|
||
|
|
||
|
Even More Arithmetic
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.13" data-path="1-06-13-exponents.html">
|
||
|
|
||
|
<a href="1-06-13-exponents.html">
|
||
|
|
||
|
|
||
|
Exponents
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.14" data-path="1-06-14-logarithms.html">
|
||
|
|
||
|
<a href="1-06-14-logarithms.html">
|
||
|
|
||
|
|
||
|
Logarithms
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.15" data-path="1-06-15-trigonometry.html">
|
||
|
|
||
|
<a href="1-06-15-trigonometry.html">
|
||
|
|
||
|
|
||
|
Trigonometry
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.6.16" data-path="1-06-16-psuedorandom-numbers.html">
|
||
|
|
||
|
<a href="1-06-16-psuedorandom-numbers.html">
|
||
|
|
||
|
|
||
|
Pseudo-Random Numbers
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
</ul>
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.7" data-path="1-07-0-arrays.html">
|
||
|
|
||
|
<a href="1-07-0-arrays.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Arrays and Vectors
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.8" data-path="1-08-0-variables.html">
|
||
|
|
||
|
<a href="1-08-0-variables.html">
|
||
|
|
||
|
|
||
|
Variables, Parameters, and Constants
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.9" data-path="1-09-0-closures.html">
|
||
|
|
||
|
<a href="1-09-0-closures.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Closures
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.10" data-path="1-10-0-functions.html">
|
||
|
|
||
|
<a href="1-10-0-functions.html">
|
||
|
|
||
|
|
||
|
Functions and Macros
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.11" data-path="1-11-0-text-adventure.html">
|
||
|
|
||
|
<a href="1-11-0-text-adventure.html">
|
||
|
|
||
|
|
||
|
Extra Credit: A Simple Text Adventure
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.12" data-path="1-12-0-namespaces.html">
|
||
|
|
||
|
<a href="1-12-0-namespaces.html">
|
||
|
|
||
|
|
||
|
Namespaces, Symbols, Packages, and Systems
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.13" data-path="1-13-0-simple-web-app.html">
|
||
|
|
||
|
<a href="1-13-0-simple-web-app.html">
|
||
|
|
||
|
|
||
|
Extra Credit: A Simple Web Application
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.14" data-path="1-14-0-conditionals.html">
|
||
|
|
||
|
<a href="1-14-0-conditionals.html">
|
||
|
|
||
|
|
||
|
Conditionals
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.15" data-path="1-15-0-command-line-utility.html">
|
||
|
|
||
|
<a href="1-15-0-command-line-utility.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Command-Line Utilities
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.16" data-path="1-16-0-map-loop.html">
|
||
|
|
||
|
<a href="1-16-0-map-loop.html">
|
||
|
|
||
|
|
||
|
Mapping and Looping
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.17" data-path="1-17-0-iterate.html">
|
||
|
|
||
|
<a href="1-17-0-iterate.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Revisiting Loops with Iterate
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.18" data-path="1-18-0-format.html">
|
||
|
|
||
|
<a href="1-18-0-format.html">
|
||
|
|
||
|
|
||
|
Format Strings
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.19" data-path="1-19-0-dsl.html">
|
||
|
|
||
|
<a href="1-19-0-dsl.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Domain Specific Languages
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="3.1.20" data-path="1-20-0-review.html">
|
||
|
|
||
|
<a href="1-20-0-review.html">
|
||
|
|
||
|
|
||
|
Part One in Review
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
</ul>
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
<li class="header">PART TWO</li>
|
||
|
|
||
|
|
||
|
|
||
|
<li class="chapter " data-level="4.1" data-path="2-0-0-overview.html">
|
||
|
|
||
|
<a href="2-0-0-overview.html">
|
||
|
|
||
|
|
||
|
The Suffusion of Blue
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
<ul class="articles">
|
||
|
|
||
|
|
||
|
<li class="chapter " data-level="4.1.1" data-path="2-01-0-programming-paradigms.html">
|
||
|
|
||
|
<a href="2-01-0-programming-paradigms.html">
|
||
|
|
||
|
|
||
|
Programming Paradigms
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.2" data-path="2-02-0-regex.html">
|
||
|
|
||
|
<a href="2-02-0-regex.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Regular Expressions
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.3" data-path="2-03-0-objects-control.html">
|
||
|
|
||
|
<a href="2-03-0-objects-control.html">
|
||
|
|
||
|
|
||
|
Objects and Control Structures
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.4" data-path="2-04-0-data-persistence.html">
|
||
|
|
||
|
<a href="2-04-0-data-persistence.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Persistence and Databases
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.5" data-path="2-05-0-extended-types.html">
|
||
|
|
||
|
<a href="2-05-0-extended-types.html">
|
||
|
|
||
|
|
||
|
Extended Types
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.6" data-path="2-06-0-threads-memos-parallel.html">
|
||
|
|
||
|
<a href="2-06-0-threads-memos-parallel.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Concurrency and Memoization
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.7" data-path="2-07-0-logic-and-more-math.html">
|
||
|
|
||
|
<a href="2-07-0-logic-and-more-math.html">
|
||
|
|
||
|
|
||
|
Logic and Advanced Math
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.8" data-path="2-08-0-number-theory.html">
|
||
|
|
||
|
<a href="2-08-0-number-theory.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Number Theory
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.9" data-path="2-09-0-binary-octets-bits.html">
|
||
|
|
||
|
<a href="2-09-0-binary-octets-bits.html">
|
||
|
|
||
|
|
||
|
Binary Streams, Octet-Vectors, and Bit-Vectors
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.10" data-path="2-10-0-improved-text-adventure-engine.html">
|
||
|
|
||
|
<a href="2-10-0-improved-text-adventure-engine.html">
|
||
|
|
||
|
|
||
|
Extra Credit: An Improved Text Adventure Engine
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.11" data-path="2-11-0-conditions.html">
|
||
|
|
||
|
<a href="2-11-0-conditions.html">
|
||
|
|
||
|
|
||
|
Conditions and Error Handling
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.12" data-path="2-12-0-2d-game.html">
|
||
|
|
||
|
<a href="2-12-0-2d-game.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Write a 2D Game
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.13" data-path="2-13-0-compiler.html">
|
||
|
|
||
|
<a href="2-13-0-compiler.html">
|
||
|
|
||
|
|
||
|
The Compiler
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.14" data-path="2-14-0-tree-shaker.html">
|
||
|
|
||
|
<a href="2-14-0-tree-shaker.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Write a Tree-Shaker
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.15" data-path="2-15-0-docs-and-inspection.html">
|
||
|
|
||
|
<a href="2-15-0-docs-and-inspection.html">
|
||
|
|
||
|
|
||
|
Documentation and Inspection
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.16" data-path="2-16-0-foreign-libs.html">
|
||
|
|
||
|
<a href="2-16-0-foreign-libs.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Foreign Libraries in Lisp
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.17" data-path="2-17-0-debugging-testing.html">
|
||
|
|
||
|
<a href="2-17-0-debugging-testing.html">
|
||
|
|
||
|
|
||
|
Debugging and Unit Testing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.18" data-path="2-18-0-ffi.html">
|
||
|
|
||
|
<a href="2-18-0-ffi.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Write a Foreign Function Interface
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.19" data-path="2-19-0-essential-libs.html">
|
||
|
|
||
|
<a href="2-19-0-essential-libs.html">
|
||
|
|
||
|
|
||
|
Essential Lisp Libraries
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.20" data-path="2-20-0-packaging-libs.html">
|
||
|
|
||
|
<a href="2-20-0-packaging-libs.html">
|
||
|
|
||
|
|
||
|
Extra Credit: Packaging Lisp Libraries
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="4.1.21" data-path="2-21-0-review.html">
|
||
|
|
||
|
<a href="2-21-0-review.html">
|
||
|
|
||
|
|
||
|
Detailed Syntax Review
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
</ul>
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
<li class="header">PART THREE</li>
|
||
|
|
||
|
|
||
|
|
||
|
<li class="chapter " data-level="5.1" data-path="3-00-00-overview.html">
|
||
|
|
||
|
<a href="3-00-00-overview.html">
|
||
|
|
||
|
|
||
|
Lisp So(u)rcery
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
<ul class="articles">
|
||
|
|
||
|
|
||
|
<li class="chapter " data-level="5.1.1" data-path="3-01-00-web-apps.html">
|
||
|
|
||
|
<a href="3-01-00-web-apps.html">
|
||
|
|
||
|
|
||
|
Real-world Web Apps
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.2" data-path="3-02-00-typesetting.html">
|
||
|
|
||
|
<a href="3-02-00-typesetting.html">
|
||
|
|
||
|
|
||
|
Typesetting
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.3" data-path="3-03-00-mobile.html">
|
||
|
|
||
|
<a href="3-03-00-mobile.html">
|
||
|
|
||
|
|
||
|
Native Mobile Applications
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.4" data-path="3-04-00-gui.html">
|
||
|
|
||
|
<a href="3-04-00-gui.html">
|
||
|
|
||
|
|
||
|
Cross-platform Desktop Applications
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.5" data-path="3-05-00-system-utils.html">
|
||
|
|
||
|
<a href="3-05-00-system-utils.html">
|
||
|
|
||
|
|
||
|
Drivers, Daemons, and System-Utilities
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.6" data-path="3-06-00-reverse-engineering.html">
|
||
|
|
||
|
<a href="3-06-00-reverse-engineering.html">
|
||
|
|
||
|
|
||
|
Reverse Engineering
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.7" data-path="3-07-00-graphics.html">
|
||
|
|
||
|
<a href="3-07-00-graphics.html">
|
||
|
|
||
|
|
||
|
Graphics Rendering
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.8" data-path="3-08-00-gaming.html">
|
||
|
|
||
|
<a href="3-08-00-gaming.html">
|
||
|
|
||
|
|
||
|
OpenGL, SDL, and 3D Game Development
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.9" data-path="3-09-00-audio.html">
|
||
|
|
||
|
<a href="3-09-00-audio.html">
|
||
|
|
||
|
|
||
|
Audio Generation and Manipulation
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.10" data-path="3-10-00-data.html">
|
||
|
|
||
|
<a href="3-10-00-data.html">
|
||
|
|
||
|
|
||
|
Data Aggregation and Analysis
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.11" data-path="3-11-00-cryptosec.html">
|
||
|
|
||
|
<a href="3-11-00-cryptosec.html">
|
||
|
|
||
|
|
||
|
Cryptography and Security
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.12" data-path="3-12-00-fintech.html">
|
||
|
|
||
|
<a href="3-12-00-fintech.html">
|
||
|
|
||
|
|
||
|
Financial Software and Crypto-Currencies
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.13" data-path="3-13-00-scientific-computing.html">
|
||
|
|
||
|
<a href="3-13-00-scientific-computing.html">
|
||
|
|
||
|
|
||
|
Scientific Computing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.14" data-path="3-14-00-computational-physics.html">
|
||
|
|
||
|
<a href="3-14-00-computational-physics.html">
|
||
|
|
||
|
|
||
|
Computational Physics
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.15" data-path="3-15-00-quantum-computing.html">
|
||
|
|
||
|
<a href="3-15-00-quantum-computing.html">
|
||
|
|
||
|
|
||
|
Quantum Computing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.16" data-path="3-16-00-nlp.html">
|
||
|
|
||
|
<a href="3-16-00-nlp.html">
|
||
|
|
||
|
|
||
|
Natural Language Processing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.17" data-path="3-17-00-ai.html">
|
||
|
|
||
|
<a href="3-17-00-ai.html">
|
||
|
|
||
|
|
||
|
Artificial Intelligence
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.18" data-path="3-18-00-robotics.html">
|
||
|
|
||
|
<a href="3-18-00-robotics.html">
|
||
|
|
||
|
|
||
|
Robotics
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.19" data-path="3-19-00-space-tech.html">
|
||
|
|
||
|
<a href="3-19-00-space-tech.html">
|
||
|
|
||
|
|
||
|
Space Tech
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.20" data-path="3-20-00-neurotech.html">
|
||
|
|
||
|
<a href="3-20-00-neurotech.html">
|
||
|
|
||
|
|
||
|
Neuroscience and Thought-Controlled Computing
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.21" data-path="3-21-00-lispos.html">
|
||
|
|
||
|
<a href="3-21-00-lispos.html">
|
||
|
|
||
|
|
||
|
A Simple LispOS
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.22" data-path="3-22-00-lisp-machine.html">
|
||
|
|
||
|
<a href="3-22-00-lisp-machine.html">
|
||
|
|
||
|
|
||
|
Build Your Own Lisp Machine
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
<li class="chapter " data-level="5.1.23" data-path="3-23-00-gov-mil.html">
|
||
|
|
||
|
<a href="3-23-00-gov-mil.html">
|
||
|
|
||
|
|
||
|
Government and Military Grade Systems
|
||
|
|
||
|
</a>
|
||
|
|
||
|
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
</ul>
|
||
|
|
||
|
</li>
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
<li class="divider"></li>
|
||
|
|
||
|
<li>
|
||
|
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
|
||
|
Published with GitBook
|
||
|
</a>
|
||
|
</li>
|
||
|
</ul>
|
||
|
|
||
|
|
||
|
</nav>
|
||
|
|
||
|
|
||
|
</div>
|
||
|
|
||
|
<div class="book-body">
|
||
|
|
||
|
<div class="body-inner">
|
||
|
|
||
|
|
||
|
|
||
|
<div class="book-header" role="navigation">
|
||
|
|
||
|
|
||
|
<!-- Title -->
|
||
|
<h1>
|
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<a href="index.html" >A Little Bit More on Format</a>
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<h1 id="exercise-1213">Exercise 1.2.13</h1>
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<h2 id="a-little-bit-more-on-format">A Little Bit More on Format</h2>
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<p>Now that you've seen how the <code>format</code> function works, we'll go through a few more control sequences that you might find useful. Again, the full tour of format string syntax won't be coming until chapter 1.18, but this should give you enough to work with for now.</p>
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<p>Try these examples out, and see if you can guess what these format control sequences do. They will be explained afterwards, but don't cheat---try them out, and see if you can guess what they do before you read on past the example.</p>
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<pre><code class="lang-lisp">(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~~"</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"H~CO"</span> #\subscript_two)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~R"</span> <span class="hljs-number">10000</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~X"</span> <span class="hljs-number">10000</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~D"</span> <span class="hljs-number">10000</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~O"</span> <span class="hljs-number">10000</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~B"</span> <span class="hljs-number">10000</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~%Hello, ~A!"</span> <span class="hljs-string">"Colin"</span>)
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(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~&I said, hello!"</span>)
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</code></pre>
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<h3 id="what-you-should-see">What You Should See</h3>
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<pre><code class="lang-lisp">(<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~~"</span>)
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<span class="hljs-string">"~"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"H~CO"</span> #\subscript_two)
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<span class="hljs-string">"H₂O"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~R"</span> <span class="hljs-number">10000</span>)
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<span class="hljs-string">"ten thousand"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~X"</span> <span class="hljs-number">10000</span>)
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<span class="hljs-string">"2710"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~D"</span> <span class="hljs-number">10000</span>)
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<span class="hljs-string">"10000"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~O"</span> <span class="hljs-number">10000</span>)
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<span class="hljs-string">"23420"</span>
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CL-USER> (<span class="hljs-name">format</span> <span class="hljs-literal">nil</span> <span class="hljs-string">"~B"</span> <span class="hljs-number">10000</span>)
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<span class="hljs-string">"10011100010000"</span>
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</code></pre>
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<p>Did you guess everything correctly? If not, don't panic. Look over what you typed and the return results, and see now if you can infer what was printed to the string.</p>
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<p>Much like with the backslash character in a regular string, you can include a tilde character in a format string with the <em>tilde-tilde</em> control sequence, <code>~~</code>. It doesn't consume any arguments.</p>
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<p>You can consume a character object argument using <code>~C</code>.</p>
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<p>You can insert an integer into a format string with <code>~R</code>, but since it can be a bit overkill with its flexibility, there are also simplified control sequences for printing the integer to hexadecimal, decimal, octet, and binary, like we did with <code>write</code> earlier: <code>~X</code>, <code>~D</code>, <code>~O</code>, and <code>~B</code>, respectively. They all consume an argument, which must be an integer.</p>
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<p>You can force the insertion of a <code>#\Newline</code> character with <code>~%</code>. It doesn't consume any arguments.</p>
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<p>And you can insert a <code>#\Newline</code> only if the output stream is not already at the beginning of a line with <code>~&</code>. It doesn't consume any arguments either.</p>
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