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<title>Debugging with GDB: Numbers</title>
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<p>
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Next: <a href="ABI.html#ABI" accesskey="n" rel="next">ABI</a>, Previous: <a href="Output-Styling.html#Output-Styling" accesskey="p" rel="previous">Output Styling</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Numbers-1"></a>
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<h3 class="section">22.6 Numbers</h3>
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<a name="index-number-representation"></a>
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<a name="index-entering-numbers"></a>
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<p>You can always enter numbers in octal, decimal, or hexadecimal in
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<small>GDB</small> by the usual conventions: octal numbers begin with
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‘<samp>0</samp>’, decimal numbers end with ‘<samp>.</samp>’, and hexadecimal numbers
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begin with ‘<samp>0x</samp>’. Numbers that neither begin with ‘<samp>0</samp>’ or
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‘<samp>0x</samp>’, nor end with a ‘<samp>.</samp>’ are, by default, entered in base
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10; likewise, the default display for numbers—when no particular
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format is specified—is base 10. You can change the default base for
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both input and output with the commands described below.
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</p>
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<dl compact="compact">
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<dd><a name="index-set-input_002dradix"></a>
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</dd>
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<dt><code>set input-radix <var>base</var></code></dt>
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<dd><p>Set the default base for numeric input. Supported choices
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for <var>base</var> are decimal 8, 10, or 16. The base must itself be
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specified either unambiguously or using the current input radix; for
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example, any of
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</p>
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<div class="smallexample">
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<pre class="smallexample">set input-radix 012
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set input-radix 10.
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set input-radix 0xa
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</pre></div>
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<p>sets the input base to decimal. On the other hand, ‘<samp>set input-radix 10</samp>’
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leaves the input radix unchanged, no matter what it was, since
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‘<samp>10</samp>’, being without any leading or trailing signs of its base, is
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interpreted in the current radix. Thus, if the current radix is 16,
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‘<samp>10</samp>’ is interpreted in hex, i.e. as 16 decimal, which doesn’t
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change the radix.
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</p>
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<a name="index-set-output_002dradix"></a>
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</dd>
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<dt><code>set output-radix <var>base</var></code></dt>
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<dd><p>Set the default base for numeric display. Supported choices
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for <var>base</var> are decimal 8, 10, or 16. The base must itself be
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specified either unambiguously or using the current input radix.
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</p>
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<a name="index-show-input_002dradix"></a>
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</dd>
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<dt><code>show input-radix</code></dt>
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<dd><p>Display the current default base for numeric input.
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</p>
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<a name="index-show-output_002dradix"></a>
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</dd>
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<dt><code>show output-radix</code></dt>
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<dd><p>Display the current default base for numeric display.
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</p>
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</dd>
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<dt><code>set radix <span class="roman">[</span><var>base</var><span class="roman">]</span></code></dt>
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<dt><code>show radix</code></dt>
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<dd><a name="index-set-radix"></a>
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<a name="index-show-radix"></a>
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<p>These commands set and show the default base for both input and output
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of numbers. <code>set radix</code> sets the radix of input and output to
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the same base; without an argument, it resets the radix back to its
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default value of 10.
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</p>
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Next: <a href="ABI.html#ABI" accesskey="n" rel="next">ABI</a>, Previous: <a href="Output-Styling.html#Output-Styling" accesskey="p" rel="previous">Output Styling</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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