mingw/info/gdb/M2-Constants.html

   1 <html lang="en">
   2 <head>
   3 <title>Debugging with GDB</title>
   4 <meta http-equiv="Content-Type" content="text/html">
   5 <meta name="description" content="Debugging with GDB">
   6 <meta name="generator" content="makeinfo 4.3">
   7 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home">
   8 </head>
   9 <body>
  10 <div class="node">
  11 <p>
  12 Node:<a name="M2%20Constants">M2 Constants</a>,
  13 Next:<a rel="next" accesskey="n" href="M2-Defaults.html#M2%20Defaults">M2 Defaults</a>,
  14 Previous:<a rel="previous" accesskey="p" href="Built-In-Func-Proc.html#Built-In%20Func%2fProc">Built-In Func/Proc</a>,
  15 Up:<a rel="up" accesskey="u" href="Modula-2.html#Modula-2">Modula-2</a>
  16 <hr><br>
  17 </div>
  18
  19 <h5 class="subsubsection">Constants</h5>
  20
  21    GDB allows you to express the constants of Modula-2 in the following
  22 ways:
  23
  24      <ul>
  25
  26      <li>Integer constants are simply a sequence of digits.  When used in an
  27 expression, a constant is interpreted to be type-compatible with the
  28 rest of the expression.  Hexadecimal integers are specified by a
  29 trailing <code>H</code>, and octal integers by a trailing <code>B</code>.
  30
  31      <li>Floating point constants appear as a sequence of digits, followed by a
  32 decimal point and another sequence of digits.  An optional exponent can
  33 then be specified, in the form <code>E</code>[<code>+</code>|<code>-</code>]<code></code><var>nnn</var><code></code>, where
  34 <code></code>[<code>+</code>|<code>-</code>]<code></code><var>nnn</var><code></code> is the desired exponent.  All of the
  35 digits of the floating point constant must be valid decimal (base 10)
  36 digits.
  37
  38      <li>Character constants consist of a single character enclosed by a pair of
  39 like quotes, either single (<code>'</code>) or double (<code>"</code>).  They may
  40 also be expressed by their ordinal value (their <small>ASCII</small> value, usually)
  41 followed by a <code>C</code>.
  42
  43      <li>String constants consist of a sequence of characters enclosed by a
  44 pair of like quotes, either single (<code>'</code>) or double (<code>"</code>).
  45 Escape sequences in the style of C are also allowed.  See <a href="C-Constants.html#C%20Constants">C and C<tt>++</tt> constants</a>, for a brief explanation of escape
  46 sequences.
  47
  48      <li>Enumerated constants consist of an enumerated identifier.
  49
  50      <li>Boolean constants consist of the identifiers <code>TRUE</code> and
  51 <code>FALSE</code>.
  52
  53      <li>Pointer constants consist of integral values only.
  54
  55      <li>Set constants are not yet supported.
  56 </ul>
  57
  58    </body></html>
  59