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| <title>Debugging with GDB: Numbers</title> |
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| <a name="Numbers-1"></a> |
| <h3 class="section">22.5 Numbers</h3> |
| <a name="index-number-representation"></a> |
| <a name="index-entering-numbers"></a> |
| |
| <p>You can always enter numbers in octal, decimal, or hexadecimal in |
| <small>GDB</small> by the usual conventions: octal numbers begin with |
| ‘<samp>0</samp>’, decimal numbers end with ‘<samp>.</samp>’, and hexadecimal numbers |
| begin with ‘<samp>0x</samp>’. Numbers that neither begin with ‘<samp>0</samp>’ or |
| ‘<samp>0x</samp>’, nor end with a ‘<samp>.</samp>’ are, by default, entered in base |
| 10; likewise, the default display for numbers—when no particular |
| format is specified—is base 10. You can change the default base for |
| both input and output with the commands described below. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-set-input_002dradix"></a> |
| </dd> |
| <dt><code>set input-radix <var>base</var></code></dt> |
| <dd><p>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 |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">set input-radix 012 |
| set input-radix 10. |
| set input-radix 0xa |
| </pre></div> |
| |
| <p>sets the input base to decimal. On the other hand, ‘<samp>set input-radix 10</samp>’ |
| leaves the input radix unchanged, no matter what it was, since |
| ‘<samp>10</samp>’, being without any leading or trailing signs of its base, is |
| interpreted in the current radix. Thus, if the current radix is 16, |
| ‘<samp>10</samp>’ is interpreted in hex, i.e. as 16 decimal, which doesn’t |
| change the radix. |
| </p> |
| <a name="index-set-output_002dradix"></a> |
| </dd> |
| <dt><code>set output-radix <var>base</var></code></dt> |
| <dd><p>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"></a> |
| </dd> |
| <dt><code>show input-radix</code></dt> |
| <dd><p>Display the current default base for numeric input. |
| </p> |
| <a name="index-show-output_002dradix"></a> |
| </dd> |
| <dt><code>show output-radix</code></dt> |
| <dd><p>Display the current default base for numeric display. |
| </p> |
| </dd> |
| <dt><code>set radix <span class="roman">[</span><var>base</var><span class="roman">]</span></code></dt> |
| <dt><code>show radix</code></dt> |
| <dd><a name="index-set-radix"></a> |
| <a name="index-show-radix"></a> |
| <p>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. |
| </p> |
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