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100 lines
4.3 KiB
HTML
100 lines
4.3 KiB
HTML
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<title>Deviations (Debugging with GDB)</title>
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Modula_002d2.html#Modula_002d2" rel="up" title="Modula-2">
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<a name="Deviations"></a>
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<p>
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Next: <a href="M2-Checks.html#M2-Checks" accesskey="n" rel="next">M2 Checks</a>, Previous: <a href="M2-Defaults.html#M2-Defaults" accesskey="p" rel="prev">M2 Defaults</a>, Up: <a href="Modula_002d2.html#Modula_002d2" accesskey="u" rel="up">Modula-2</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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<hr>
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<a name="Deviations-from-Standard-Modula_002d2"></a>
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<h4 class="subsubsection">15.4.9.6 Deviations from Standard Modula-2</h4>
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<a name="index-Modula_002d2_002c-deviations-from"></a>
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<p>A few changes have been made to make Modula-2 programs easier to debug.
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This is done primarily via loosening its type strictness:
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</p>
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<ul>
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<li> Unlike in standard Modula-2, pointer constants can be formed by
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integers. This allows you to modify pointer variables during
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debugging. (In standard Modula-2, the actual address contained in a
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pointer variable is hidden from you; it can only be modified
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through direct assignment to another pointer variable or expression that
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returned a pointer.)
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</li><li> C escape sequences can be used in strings and characters to represent
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non-printable characters. <small>GDB</small> prints out strings with these
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escape sequences embedded. Single non-printable characters are
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printed using the ‘<samp>CHR(<var>nnn</var>)</samp>’ format.
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</li><li> The assignment operator (<code>:=</code>) returns the value of its right-hand
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argument.
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</li><li> All built-in procedures both modify <em>and</em> return their argument.
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</li></ul>
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