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+<title>Macros</title>
+<head>
+<script language="JavaScript">
+</script>
+</head>
+<body bgcolor="#ffffcc">
+<hr>
+<center>
+<h1>Macros</h1>
+</center>
+<hr>
+<p>
+Macros are built on the <a href="define_preprocessor.html">#define</a> 
+preprocessor.<p>
+Normally a #define would look like:
+<pre>
+	#define PI 3.142
+</pre>
+But, a macro would look like this.
+<pre>
+	#define SQUARE(x) x*x
+</pre>
+The main difference is that the first example is a constant and the second 
+is an expression. 
+If the <b>macro</b> above was used in some code it may look like this:
+<pre>
+        #define SQUARE(x)  x*x
+
+        main()
+        {
+          int value=3;
+          printf("%d \n", SQUARE(value));
+        }
+</pre>
+After preprocessing the code would become:
+<pre>
+        main()
+        {
+          int value=3;
+          printf("%d \n", value*value);
+        }
+</pre>
+<hr>
+<h2>Examples:</h2>
+
+<a href="../EXAMPLES/macro.c"><img src="../../GRAPHICS/computer.gif"></a>
+macro example.<p>
+<hr>
+<h2>Notes:</h2>
+<ul>
+<li>The value passed to SQUARE could have been an 
+<a href="../CONCEPT/data_types.html#int">int</a>
+<a href="../CONCEPT/data_types.html#float">float</a>
+or
+<a href="../CONCEPT/data_types.html#double">double</a>
+<li>Long macros can span multiple lines by using a 
+<a href="../FUNCTIONS/escape.html">\</a> followed by a newline
+(return).
+<li>If you are using gcc to compile your code, you can use the -E option to
+see the preprocessor output 
+</ul>
+<hr>
+<h2>See Also:</h2>
+<ul>
+<li><A href="define_preprocessor.html">#define</a> preprocessor.
+<font color=brown>
+<li><A href="../../CPLUSPLUS/SYNTAX/inline.html">inline</a> A C++ keyword that provides a better aproch to macros.
+</font>
+</ul>
+
+
+<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>