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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<title>The enum statement</title>
+<head>
+<script language="JavaScript">
+</script>
+</head>
+<body bgcolor="#ffffcc">
+<hr>
+<center>
+<h1>The enum statement</h1>
+</center>
+<hr>
+<p>
+ENUM is closely related to the <a href="define_preprocessor.html">#define</a>
+preprocessor.<p>
+It allows you to define a list of aliases which represent integer numbers. For
+example if you find yourself coding something like:
+<pre>
+ #define MON 1
+ #define TUE 2
+ #define WED 3
+</pre>
+You could use <b>enum</b> as below.
+<pre>
+ enum week { Mon=1, Tue, Wed, Thu, Fri Sat, Sun} days;
+ or
+ enum escapes { BELL = '\a', BACKSPACE = '\b', HTAB = '\t',
+ RETURN = '\r', NEWLINE = '\n', VTAB = '\v' };
+
+ or
+ enum boolean { FALSE = 0, TRUE };
+
+</pre>
+
+An advantage of <b>enum</b> over <b>#define</b> is that it has
+<a href="../glossary.html#scope">scope</a>
+This means that the variable (just like any other) is only visable
+within the block it was declared within.
+<p>
+<hr>
+<h2>Notes:</h2>
+<ul>
+<li>If a variable is
+<a href="../glossary.html#definition">defined</a>
+with <b>enum</b> it is considered by
+the compiler to be an integer, and can have ANY integer value assigned
+to it, it is not restericted to the values in the enum statement.
+</ul>
+
+
+<hr>
+<h2>See Also:</h2>
+
+<a href=../../CPLUSPLUS/SYNTAX/enum.html> C++ Enhancements to enum.</a><p>
+<a href=define_preprocessor.html>#define</a> preprocessor.<p>
+
+<hr>
+<h2>Examples:</h2>
+
+<a href="../EXAMPLES/enum1.c"><img src="../../GRAPHICS/computer.gif"></a>
+enum example 1.<p>
+<a href="../EXAMPLES/enum2.c"><img src="../../GRAPHICS/computer.gif"></a>
+enum example 2.<p>
+
+<a href="../EXAMPLES/enum3.c"><img src="../../GRAPHICS/computer.gif"></a>
+enum coding error.<p>
+
+<a href="../EXAMPLES/enum4.c"><img src="../../GRAPHICS/computer.gif"></a>
+Another enum coding error.<p>
+
+<a href="../EXAMPLES/enum5.c"><img src="../../GRAPHICS/computer.gif"></a>
+enum and #define coding error.<p>
+
+<p>
+
+<hr>
+<p>
+<center>
+<table border=2 width="80%" bgcolor="ivory">
+<tr align=center>
+<td width="25%">
+<a href="../cref.html"> Top</a>
+</td><td width="25%">
+<a href="../master_index.html"> Master Index</a>
+</td><td width="25%">
+<a href="keywords.html"> Keywords</a>
+</td><td width="25%">
+<a href="../FUNCTIONS/funcref.htm"> Functions</a>
+</td>
+</tr>
+</table>
+</center>
+<p>
+<hr>
+<address>Martin Leslie
+</address><p>
+</body>
+</html>