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| <a name="Constants-1"></a> |
| <h4 class="subsubsection">15.4.8.3 Constants</h4> |
| |
| <p><small>GDB</small> allows you to express the constants of Modula-2 in the following |
| ways: |
| </p> |
| <ul> |
| <li> Integer constants are simply a sequence of digits. When used in an |
| expression, a constant is interpreted to be type-compatible with the |
| rest of the expression. Hexadecimal integers are specified by a |
| trailing ‘<samp>H</samp>’, and octal integers by a trailing ‘<samp>B</samp>’. |
| |
| </li><li> Floating point constants appear as a sequence of digits, followed by a |
| decimal point and another sequence of digits. An optional exponent can |
| then be specified, in the form ‘<samp>E<span class="roman">[</span>+<span class="roman">|</span>-<span class="roman">]</span><var>nnn</var></samp>’, where |
| ‘<samp><span class="roman">[</span>+<span class="roman">|</span>-<span class="roman">]</span><var>nnn</var></samp>’ is the desired exponent. All of the |
| digits of the floating point constant must be valid decimal (base 10) |
| digits. |
| |
| </li><li> Character constants consist of a single character enclosed by a pair of |
| like quotes, either single (<code>'</code>) or double (<code>"</code>). They may |
| also be expressed by their ordinal value (their <small>ASCII</small> value, usually) |
| followed by a ‘<samp>C</samp>’. |
| |
| </li><li> String constants consist of a sequence of characters enclosed by a |
| pair of like quotes, either single (<code>'</code>) or double (<code>"</code>). |
| Escape sequences in the style of C are also allowed. See <a href="C-Constants.html#C-Constants">C and C<tt>++</tt> Constants</a>, for a brief explanation of escape |
| sequences. |
| |
| </li><li> Enumerated constants consist of an enumerated identifier. |
| |
| </li><li> Boolean constants consist of the identifiers <code>TRUE</code> and |
| <code>FALSE</code>. |
| |
| </li><li> Pointer constants consist of integral values only. |
| |
| </li><li> Set constants are not yet supported. |
| </li></ul> |
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