NestedLoopsSameVariable.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>
<overview>
<p>Inner loops should not write to the iteration variables of the enclosing loop. If an inner loop 
changes the iteration variable of the enclosing loop this is normally because the programmer 
mistyped the iteration variable of the inner loop. If this is the intended behavior, then this is 
an example of bad practice. Loops should be designed so that each loop controls its own iteration. 
Nested loops where iteration is shared between loops are more difficult to understand and maintain.
</p>

</overview>
<recommendation>
<p>If there is a mistake in the code then correct it. If the behavior is intended then consider 
redesigning the way that iteration of the loops is controlled. This will make the code easier for 
other programmers to understand and maintain.</p>

</recommendation>
<example>
<p>This example will run forever because the inner loop increments i instead of j.</p>
<sample src="NestedLoopsSameVariable.cs" />

</example>
<references>

  <li>MSDN: <a href="http://msdn.microsoft.com/en-us/library/ch45axte.aspx">for</a>.</li>

</references>
</qhelp>