AV Rule 197.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>


<overview>
<p>
This rule finds <code>float</code> variables being used as loop counter. <code>float</code> values
are prone to rounding and truncation. In particular, very large and very small
float values are prone to rounding errors and could lead to unexpected loop behavior.
</p>

</overview>
<recommendation>
<p>
Use an integral variable instead of a float variable for the loop counter.
</p>

</recommendation>
<example><sample src="AV Rule 197.cpp" />



</example>
<references>

<li>
  AV Rule 197, <em>Joint Strike Fighter Air Vehicle C++ Coding Standards</em>. Lockheed Martin Corporation, 2005.
</li>
<li>
  MISRA C++ Rule 6-5-1, <em>Guidelines for the use of the C++ language in critical systems</em>. The Motor Industry Software Reliability Associate, 2008.
</li>
<li>
  <a href="https://www.securecoding.cert.org/confluence/display/c/FLP30-C.+Do+not+use+floating-point+variables+as+loop+counters">FLP30-C. Do not use floating-point variables as loop counters</a>
</li>


</references>
</qhelp>