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+<html>
+<head>
+<title>The TYPEDEF keyword.</title>
+<script language="JavaScript">
+</script>
+</head>
+<body bgcolor="#ffffcc">
+<hr>
+<center><h1>The TYPEDEF keyword.</h1></center>
+<hr>
+<p>
+Every variable has a 
+<a href="../CONCEPT/data_types.html">data type</a>. <b>typedef</b> is used to define 
+new data type names to make a program more readable to the programmer.
+<p>
+For example:
+<p>
+<table border=1 width="100%" bgcolor="ivory">
+<tr><td>
+<pre>
+
+				|
+	main()	                |   main()
+        {	                |   {
+  	    int money;          |       typedef int Pounds;
+            money = 2;          |       Pounds money = 2
+        }	                |   } 
+</pre>
+</td></tr></table>
+<p>
+These examples are EXACTLY the same to the compiler. But the right hand
+example tells the programmer the type of money he is dealing with.
+<p>
+<a name=boolean></a>
+A common use for typedef is to define a boolean data type as below.
+<font color="brown">
+<br>
+Note: Recent C++ compilers have introduced a <a href="../../CPLUSPLUS/SYNTAX/bool.html">boolean</a> datatype.
+<p>
+</font>
+<p>
+<table border=1 width="100%" bgcolor="ivory">
+<tr><td>
+<pre>
+
+	typedef enum {FALSE=0, TRUE} Boolean
+
+	main ()
+        {
+	    Boolean flag = TRUE;
+	}
+        
+</pre>
+</td></tr></table>
+<p>
+
+And as a final example, how about creating a string datatype?
+<p>
+<table border=1 width="100%" bgcolor="ivory">
+<tr><td>
+<pre>
+
+     typedef char *String;
+     
+     main()
+     {
+         String Text = "Thunderbird";
+       
+         printf("%s\n", Text);
+     }
+     
+</pre>
+</td></tr></table>
+<p>
+
+The main use for typedef seems to be defining 
+<a href="struct.html">structures</a>. For example:
+<p>
+<table border=1 width="100%" bgcolor="ivory">
+<tr><td>
+<pre>
+
+	typedef struct {int age; char *name} person;
+	person people;
+
+</pre>
+</td></tr></table>
+<p>
+
+Take care to note that <b>person</b> is now a type specifier and NOT a
+variable name.
+<p>                                          
+As a final note, you can create several data types in one hit. 
+<table border=1 width="100%" bgcolor=ivory>
+<tr><td>
+<pre>
+
+
+	typedef int Pounds, Shillings, Pennies, Dollars, Cents;  
+
+</pre>
+</td></tr></table>
+<p>
+
+<p>
+<hr>
+<h2>Examples:</h2>
+<img src="../../GRAPHICS/computer.gif" align=center>
+<a href="../EXAMPLES/linklst3.c">Here is a rather heavy example of typedef.</a>
+<br clear=left>
+<hr>
+<h2>Notes:</h2>
+I would expect to see 'typedef' in header files.
+
+<p>
+
+<hr>
+<p>
+<center>
+<table border=2 width="80%" bgcolor="ivory">
+<tr align=center>
+<td width="25%">
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+</table>
+</center>
+<p>
+<hr>
+<address>Martin Leslie 
+</address><p>
+</body>
+</html>
+