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+<title>Increment and decrement.</title>
+<body bgcolor="#ffffcc">
+<hr>
+<center>
+<h1>Increment and decrement.</h1>
+</center>
+<hr>
+
+The traditional method of incrementing numbers is by coding something like:
+<pre>
+	a = a + 1;
+</pre>
+Within C, this syntax is valid but you can also use the ++ operator to perform
+the same function.
+<pre>
+	a++;
+</pre>
+will also add 1 to the value of <b>a</b>. 
+By using a simular syntax you can also decrement a variable as shown below.
+<pre>
+	a--;
+</pre>
+These operators can be placed as a prefix or post fix as below:
+<pre>
+	a++;		++a;
+</pre>
+When used on their own (as above) the prefix and postfix have the same effect
+BUT within an expression there is a subtle difference....<p>
+
+<ol>
+<li>Prefix notation will increment the variable BEFORE the 
+expression is evaluated.
+<li>Postfix notation will increment AFTER the expression evaluation.
+</ol>
+
+Here is an example:
+<pre>
+	main()				main()
+	{				{
+	  int a=1;			  int a=1;
+	  printf(" a is %d", ++a);	  printf(" a is %d", a++);
+        }				}
+
+</pre>
+
+In both examples, the final value of <b>a</b> will be 2. BUT the first 
+example will print 2 and the second will print 1.
+
+<hr>
+<img src=../../GRAPHICS/computer.gif>
+<a href="../EXAMPLES/inc_dec.c"> Example program.</a><br>
+
+<img src=../../GRAPHICS/whiteball.gif>
+<a href="../CONCEPT/expressions.html">Other operators.</a><br>
+
+<img src=../../GRAPHICS/whiteball.gif>
+<a href="../CONCEPT/precedence.html">Operator precedence table.</a>
+<hr>
+<p>
+<center>
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+<p>
+ 
+<hr>
+<address>Martin Leslie
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