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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>
<head>
<title>SWI-Prolog 7.1.10 Reference Manual</title><link rel="home" href="index.html">
<link rel="contents" href="Contents.html">
<link rel="index" href="DocIndex.html">
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<h1 id="sec:builtin"><a id="sec:4"><span class="sec-nr">4</span> <span class="sec-title">Built-in 
Predicates</span></a></h1>

<a id="sec:builtin"></a>

<p>
<hr>
<div style="text-align:center">

<h2>Section Index</h2>

</div>
<hr>
<div class="toc">
<div class="toc-h2"><a class="sec" href="preddesc.html"><span class="sec-nr">4.1</span> <span class="sec-title">Notation 
of Predicate Descriptions</span></a></div>
<div class="toc-h2"><a class="sec" href="chars.html"><span class="sec-nr">4.2</span> <span class="sec-title">Character 
representation</span></a></div>
<div class="toc-h2"><a class="sec" href="consulting.html"><span class="sec-nr">4.3</span> <span class="sec-title">Loading 
Prolog source files</span></a></div>
<div class="toc-h3"><a class="sec" href="consulting.html#sec:4.3.1"><span class="sec-nr">4.3.1</span> <span class="sec-title">Conditional 
compilation and program transformation</span></a></div>
<div class="toc-h4"><a class="sec" href="consulting.html#sec:4.3.1.1"><span class="sec-nr">4.3.1.1</span> <span class="sec-title">Program 
transformation with source layout info</span></a></div>
<div class="toc-h4"><a class="sec" href="consulting.html#sec:4.3.1.2"><span class="sec-nr">4.3.1.2</span> <span class="sec-title">Conditional 
compilation</span></a></div>
<div class="toc-h3"><a class="sec" href="consulting.html#sec:4.3.2"><span class="sec-nr">4.3.2</span> <span class="sec-title">Loading 
files, active code and threads</span></a></div>
<div class="toc-h4"><a class="sec" href="consulting.html#sec:4.3.2.1"><span class="sec-nr">4.3.2.1</span> <span class="sec-title">Compilation 
of mutually dependent code</span></a></div>
<div class="toc-h4"><a class="sec" href="consulting.html#sec:4.3.2.2"><span class="sec-nr">4.3.2.2</span> <span class="sec-title">Compilation 
with multiple threads</span></a></div>
<div class="toc-h4"><a class="sec" href="consulting.html#sec:4.3.2.3"><span class="sec-nr">4.3.2.3</span> <span class="sec-title">Reloading 
running code</span></a></div>
<div class="toc-h3"><a class="sec" href="consulting.html#sec:4.3.3"><span class="sec-nr">4.3.3</span> <span class="sec-title">Quick 
load files</span></a></div>
<div class="toc-h2"><a class="sec" href="edit.html"><span class="sec-nr">4.4</span> <span class="sec-title">Editor 
Interface</span></a></div>
<div class="toc-h3"><a class="sec" href="edit.html#sec:4.4.1"><span class="sec-nr">4.4.1</span> <span class="sec-title">Customizing 
the editor interface</span></a></div>
<div class="toc-h2"><a class="sec" href="listing.html"><span class="sec-nr">4.5</span> <span class="sec-title">List 
the program, predicates or clauses</span></a></div>
<div class="toc-h2"><a class="sec" href="typetest.html"><span class="sec-nr">4.6</span> <span class="sec-title">Verify 
Type of a Term</span></a></div>
<div class="toc-h2"><a class="sec" href="compare.html"><span class="sec-nr">4.7</span> <span class="sec-title">Comparison 
and Unification of Terms</span></a></div>
<div class="toc-h3"><a class="sec" href="compare.html#sec:4.7.1"><span class="sec-nr">4.7.1</span> <span class="sec-title">Standard 
Order of Terms</span></a></div>
<div class="toc-h3"><a class="sec" href="compare.html#sec:4.7.2"><span class="sec-nr">4.7.2</span> <span class="sec-title">Special 
unification and comparison predicates</span></a></div>
<div class="toc-h2"><a class="sec" href="control.html"><span class="sec-nr">4.8</span> <span class="sec-title">Control 
Predicates</span></a></div>
<div class="toc-h2"><a class="sec" href="metacall.html"><span class="sec-nr">4.9</span> <span class="sec-title">Meta-Call 
Predicates</span></a></div>
<div class="toc-h2"><a class="sec" href="exception.html"><span class="sec-nr">4.10</span> <span class="sec-title">ISO 
compliant Exception handling</span></a></div>
<div class="toc-h3"><a class="sec" href="exception.html#sec:4.10.1"><span class="sec-nr">4.10.1</span> <span class="sec-title">Debugging 
and exceptions</span></a></div>
<div class="toc-h3"><a class="sec" href="exception.html#sec:4.10.2"><span class="sec-nr">4.10.2</span> <span class="sec-title">The 
exception term</span></a></div>
<div class="toc-h3"><a class="sec" href="exception.html#sec:4.10.3"><span class="sec-nr">4.10.3</span> <span class="sec-title">Printing 
messages</span></a></div>
<div class="toc-h4"><a class="sec" href="exception.html#sec:4.10.3.1"><span class="sec-nr">4.10.3.1</span> <span class="sec-title">Printing 
from libraries</span></a></div>
<div class="toc-h2"><a class="sec" href="signal.html"><span class="sec-nr">4.11</span> <span class="sec-title">Handling 
signals</span></a></div>
<div class="toc-h3"><a class="sec" href="signal.html#sec:4.11.1"><span class="sec-nr">4.11.1</span> <span class="sec-title">Notes 
on signal handling</span></a></div>
<div class="toc-h2"><a class="sec" href="DCG.html"><span class="sec-nr">4.12</span> <span class="sec-title">DCG 
Grammar rules</span></a></div>
<div class="toc-h2"><a class="sec" href="db.html"><span class="sec-nr">4.13</span> <span class="sec-title">Database</span></a></div>
<div class="toc-h3"><a class="sec" href="db.html#sec:4.13.1"><span class="sec-nr">4.13.1</span> <span class="sec-title">Update 
view</span></a></div>
<div class="toc-h3"><a class="sec" href="db.html#sec:4.13.2"><span class="sec-nr">4.13.2</span> <span class="sec-title">Indexing 
databases</span></a></div>
<div class="toc-h2"><a class="sec" href="dynamic.html"><span class="sec-nr">4.14</span> <span class="sec-title">Declaring 
predicate properties</span></a></div>
<div class="toc-h2"><a class="sec" href="examineprog.html"><span class="sec-nr">4.15</span> <span class="sec-title">Examining 
the program</span></a></div>
<div class="toc-h2"><a class="sec" href="IO.html"><span class="sec-nr">4.16</span> <span class="sec-title">Input 
and output</span></a></div>
<div class="toc-h3"><a class="sec" href="IO.html#sec:4.16.1"><span class="sec-nr">4.16.1</span> <span class="sec-title">Predefined 
stream aliases</span></a></div>
<div class="toc-h3"><a class="sec" href="IO.html#sec:4.16.2"><span class="sec-nr">4.16.2</span> <span class="sec-title">ISO 
Input and Output Streams</span></a></div>
<div class="toc-h3"><a class="sec" href="IO.html#sec:4.16.3"><span class="sec-nr">4.16.3</span> <span class="sec-title">Edinburgh-style 
I/O</span></a></div>
<div class="toc-h3"><a class="sec" href="IO.html#sec:4.16.4"><span class="sec-nr">4.16.4</span> <span class="sec-title">Switching 
between Edinburgh and ISO I/O</span></a></div>
<div class="toc-h3"><a class="sec" href="IO.html#sec:4.16.5"><span class="sec-nr">4.16.5</span> <span class="sec-title">Write 
onto atoms, code-lists, etc.</span></a></div>
<div class="toc-h2"><a class="sec" href="streamstat.html"><span class="sec-nr">4.17</span> <span class="sec-title">Status 
of streams</span></a></div>
<div class="toc-h2"><a class="sec" href="chario.html"><span class="sec-nr">4.18</span> <span class="sec-title">Primitive 
character I/O</span></a></div>
<div class="toc-h2"><a class="sec" href="termrw.html"><span class="sec-nr">4.19</span> <span class="sec-title">Term 
reading and writing</span></a></div>
<div class="toc-h2"><a class="sec" href="manipterm.html"><span class="sec-nr">4.20</span> <span class="sec-title">Analysing 
and Constructing Terms</span></a></div>
<div class="toc-h3"><a class="sec" href="manipterm.html#sec:4.20.1"><span class="sec-nr">4.20.1</span> <span class="sec-title">Non-logical 
operations on terms</span></a></div>
<div class="toc-h2"><a class="sec" href="manipatom.html"><span class="sec-nr">4.21</span> <span class="sec-title">Analysing 
and Constructing Atoms</span></a></div>
<div class="toc-h2"><a class="sec" href="locale.html"><span class="sec-nr">4.22</span> <span class="sec-title">Localization 
(locale) support</span></a></div>
<div class="toc-h2"><a class="sec" href="chartype.html"><span class="sec-nr">4.23</span> <span class="sec-title">Character 
properties</span></a></div>
<div class="toc-h3"><a class="sec" href="chartype.html#sec:4.23.1"><span class="sec-nr">4.23.1</span> <span class="sec-title">Case 
conversion</span></a></div>
<div class="toc-h3"><a class="sec" href="chartype.html#sec:4.23.2"><span class="sec-nr">4.23.2</span> <span class="sec-title">White 
space normalization</span></a></div>
<div class="toc-h3"><a class="sec" href="chartype.html#sec:4.23.3"><span class="sec-nr">4.23.3</span> <span class="sec-title">Language-specific 
comparison</span></a></div>
<div class="toc-h2"><a class="sec" href="strings.html"><span class="sec-nr">4.24</span> <span class="sec-title">Representing 
text in strings</span></a></div>
<div class="toc-h2"><a class="sec" href="operators.html"><span class="sec-nr">4.25</span> <span class="sec-title">Operators</span></a></div>
<div class="toc-h2"><a class="sec" href="charconv.html"><span class="sec-nr">4.26</span> <span class="sec-title">Character 
Conversion</span></a></div>
<div class="toc-h2"><a class="sec" href="arith.html"><span class="sec-nr">4.27</span> <span class="sec-title">Arithmetic</span></a></div>
<div class="toc-h3"><a class="sec" href="arith.html#sec:4.27.1"><span class="sec-nr">4.27.1</span> <span class="sec-title">Special 
purpose integer arithmetic</span></a></div>
<div class="toc-h3"><a class="sec" href="arith.html#sec:4.27.2"><span class="sec-nr">4.27.2</span> <span class="sec-title">General 
purpose arithmetic</span></a></div>
<div class="toc-h4"><a class="sec" href="arith.html#sec:4.27.2.1"><span class="sec-nr">4.27.2.1</span> <span class="sec-title">Arithmetic 
types</span></a></div>
<div class="toc-h4"><a class="sec" href="arith.html#sec:4.27.2.2"><span class="sec-nr">4.27.2.2</span> <span class="sec-title">Rational 
number examples</span></a></div>
<div class="toc-h4"><a class="sec" href="arith.html#sec:4.27.2.3"><span class="sec-nr">4.27.2.3</span> <span class="sec-title">Arithmetic 
Functions</span></a></div>
<div class="toc-h2"><a class="sec" href="miscarith.html"><span class="sec-nr">4.28</span> <span class="sec-title">Misc 
arithmetic support predicates</span></a></div>
<div class="toc-h2"><a class="sec" href="builtinlist.html"><span class="sec-nr">4.29</span> <span class="sec-title">Built-in 
list operations</span></a></div>
<div class="toc-h2"><a class="sec" href="allsolutions.html"><span class="sec-nr">4.30</span> <span class="sec-title">Finding 
all Solutions to a Goal</span></a></div>
<div class="toc-h2"><a class="sec" href="forall2.html"><span class="sec-nr">4.31</span> <span class="sec-title">Forall</span></a></div>
<div class="toc-h2"><a class="sec" href="format.html"><span class="sec-nr">4.32</span> <span class="sec-title">Formatted 
Write</span></a></div>
<div class="toc-h3"><a class="sec" href="format.html#sec:4.32.1"><span class="sec-nr">4.32.1</span> <span class="sec-title">Writef</span></a></div>
<div class="toc-h3"><a class="sec" href="format.html#sec:4.32.2"><span class="sec-nr">4.32.2</span> <span class="sec-title">Format</span></a></div>
<div class="toc-h3"><a class="sec" href="format.html#sec:4.32.3"><span class="sec-nr">4.32.3</span> <span class="sec-title">Programming 
Format</span></a></div>
<div class="toc-h2"><a class="sec" href="tty.html"><span class="sec-nr">4.33</span> <span class="sec-title">Terminal 
Control</span></a></div>
<div class="toc-h2"><a class="sec" href="system.html"><span class="sec-nr">4.34</span> <span class="sec-title">Operating 
System Interaction</span></a></div>
<div class="toc-h3"><a class="sec" href="system.html#sec:4.34.1"><span class="sec-nr">4.34.1</span> <span class="sec-title">Windows-specific 
Operating System Interaction</span></a></div>
<div class="toc-h3"><a class="sec" href="system.html#sec:4.34.2"><span class="sec-nr">4.34.2</span> <span class="sec-title">Dealing 
with time and date</span></a></div>
<div class="toc-h4"><a class="sec" href="system.html#sec:4.34.2.1"><span class="sec-nr">4.34.2.1</span> <span class="sec-title">Time 
and date data structures</span></a></div>
<div class="toc-h4"><a class="sec" href="system.html#sec:4.34.2.2"><span class="sec-nr">4.34.2.2</span> <span class="sec-title">Time 
and date predicates</span></a></div>
<div class="toc-h3"><a class="sec" href="system.html#sec:4.34.3"><span class="sec-nr">4.34.3</span> <span class="sec-title">Controlling 
the <b>swipl-win.exe</b> console window</span></a></div>
<div class="toc-h2"><a class="sec" href="files.html"><span class="sec-nr">4.35</span> <span class="sec-title">File 
System Interaction</span></a></div>
<div class="toc-h2"><a class="sec" href="toplevel.html"><span class="sec-nr">4.36</span> <span class="sec-title">User 
Top-level Manipulation</span></a></div>
<div class="toc-h2"><a class="sec" href="protocol.html"><span class="sec-nr">4.37</span> <span class="sec-title">Creating 
a Protocol of the User Interaction</span></a></div>
<div class="toc-h2"><a class="sec" href="debugger.html"><span class="sec-nr">4.38</span> <span class="sec-title">Debugging 
and Tracing Programs</span></a></div>
<div class="toc-h2"><a class="sec" href="statistics.html"><span class="sec-nr">4.39</span> <span class="sec-title">Obtaining 
Runtime Statistics</span></a></div>
<div class="toc-h2"><a class="sec" href="profile.html"><span class="sec-nr">4.40</span> <span class="sec-title">Execution 
profiling</span></a></div>
<div class="toc-h3"><a class="sec" href="profile.html#sec:4.40.1"><span class="sec-nr">4.40.1</span> <span class="sec-title">Profiling 
predicates</span></a></div>
<div class="toc-h3"><a class="sec" href="profile.html#sec:4.40.2"><span class="sec-nr">4.40.2</span> <span class="sec-title">Visualizing 
profiling data</span></a></div>
<div class="toc-h3"><a class="sec" href="profile.html#sec:4.40.3"><span class="sec-nr">4.40.3</span> <span class="sec-title">Information 
gathering</span></a></div>
<div class="toc-h4"><a class="sec" href="profile.html#sec:4.40.3.1"><span class="sec-nr">4.40.3.1</span> <span class="sec-title">Profiling 
in the Windows Implementation</span></a></div>
<div class="toc-h2"><a class="sec" href="memory.html"><span class="sec-nr">4.41</span> <span class="sec-title">Memory 
Management</span></a></div>
<div class="toc-h2"><a class="sec" href="DDE.html"><span class="sec-nr">4.42</span> <span class="sec-title">Windows 
DDE interface</span></a></div>
<div class="toc-h3"><a class="sec" href="DDE.html#sec:4.42.1"><span class="sec-nr">4.42.1</span> <span class="sec-title">DDE 
client interface</span></a></div>
<div class="toc-h3"><a class="sec" href="DDE.html#sec:4.42.2"><span class="sec-nr">4.42.2</span> <span class="sec-title">DDE 
server mode</span></a></div>
<div class="toc-h2"><a class="sec" href="miscpreds.html"><span class="sec-nr">4.43</span> <span class="sec-title">Miscellaneous</span></a></div>
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