<html lang="en">
<head>
<title>Numbers - Debugging with GDB</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Debugging with GDB">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Controlling-GDB.html#Controlling-GDB" title="Controlling GDB">
<link rel="prev" href="Screen-Size.html#Screen-Size" title="Screen Size">
<link rel="next" href="ABI.html#ABI" title="ABI">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being ``Free Software'' and ``Free Software Needs
Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
and with the Back-Cover Texts as in (a) below.

(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
this GNU Manual.  Buying copies from GNU Press supports the FSF in
developing GNU and promoting software freedom.''-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
  pre.display { font-family:inherit }
  pre.format  { font-family:inherit }
  pre.smalldisplay { font-family:inherit; font-size:smaller }
  pre.smallformat  { font-family:inherit; font-size:smaller }
  pre.smallexample { font-size:smaller }
  pre.smalllisp    { font-size:smaller }
  span.sc    { font-variant:small-caps }
  span.roman { font-family:serif; font-weight:normal; } 
  span.sansserif { font-family:sans-serif; font-weight:normal; } 
--></style>
<link rel="stylesheet" type="text/css" href="../cs.css">
</head>
<body>
<div class="node">
<a name="Numbers"></a>
<p>
Next:&nbsp;<a rel="next" accesskey="n" href="ABI.html#ABI">ABI</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Screen-Size.html#Screen-Size">Screen Size</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Controlling-GDB.html#Controlling-GDB">Controlling GDB</a>
<hr>
</div>

<h3 class="section">22.5 Numbers</h3>

<p><a name="index-number-representation-1462"></a><a name="index-entering-numbers-1463"></a>
You can always enter numbers in octal, decimal, or hexadecimal in
<span class="sc">gdb</span> by the usual conventions: octal numbers begin with
&lsquo;<samp><span class="samp">0</span></samp>&rsquo;, decimal numbers end with &lsquo;<samp><span class="samp">.</span></samp>&rsquo;, and hexadecimal numbers
begin with &lsquo;<samp><span class="samp">0x</span></samp>&rsquo;.  Numbers that neither begin with &lsquo;<samp><span class="samp">0</span></samp>&rsquo; or
&lsquo;<samp><span class="samp">0x</span></samp>&rsquo;, nor end with a &lsquo;<samp><span class="samp">.</span></samp>&rsquo; are, by default, entered in base
10; likewise, the default display for numbers&mdash;when no particular
format is specified&mdash;is base 10.  You can change the default base for
both input and output with the commands described below.

     
<a name="index-set-input_002dradix-1464"></a>
<dl><dt><code>set input-radix </code><var>base</var><dd>Set the default base for numeric input.  Supported choices
for <var>base</var> are decimal 8, 10, or 16.  <var>base</var> must itself be
specified either unambiguously or using the current input radix; for
example, any of

     <pre class="smallexample">          set input-radix 012
          set input-radix 10.
          set input-radix 0xa
</pre>
     <p class="noindent">sets the input base to decimal.  On the other hand, &lsquo;<samp><span class="samp">set input-radix 10</span></samp>&rsquo;
leaves the input radix unchanged, no matter what it was, since
&lsquo;<samp><span class="samp">10</span></samp>&rsquo;, being without any leading or trailing signs of its base, is
interpreted in the current radix.  Thus, if the current radix is 16,
&lsquo;<samp><span class="samp">10</span></samp>&rsquo; is interpreted in hex, i.e. as 16 decimal, which doesn't
change the radix.

     <p><a name="index-set-output_002dradix-1465"></a><br><dt><code>set output-radix </code><var>base</var><dd>Set the default base for numeric display.  Supported choices
for <var>base</var> are decimal 8, 10, or 16.  <var>base</var> must itself be
specified either unambiguously or using the current input radix.

     <p><a name="index-show-input_002dradix-1466"></a><br><dt><code>show input-radix</code><dd>Display the current default base for numeric input.

     <p><a name="index-show-output_002dradix-1467"></a><br><dt><code>show output-radix</code><dd>Display the current default base for numeric display.

     <br><dt><code>set radix </code><span class="roman">[</span><var>base</var><span class="roman">]</span><dt><code>show radix</code><dd><a name="index-set-radix-1468"></a><a name="index-show-radix-1469"></a>These commands set and show the default base for both input and output
of numbers.  <code>set radix</code> sets the radix of input and output to
the same base; without an argument, it resets the radix back to its
default value of 10.

   </dl>

   </body></html>