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<h3 class="section">22.6 Numbers</h3>

<p><a name="index-number-representation-1694"></a><a name="index-entering-numbers-1695"></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-1696"></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.  The base 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-1697"></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.  The base must itself be
specified either unambiguously or using the current input radix.

     <p><a name="index-show-input_002dradix-1698"></a><br><dt><code>show input-radix</code><dd>Display the current default base for numeric input.

     <p><a name="index-show-output_002dradix-1699"></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-1700"></a><a name="index-show-radix-1701"></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>

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