Class Methods in C++
<p>Can anyone tell me how you can make sure a method can only access and not change private data members in a C++ class instance is the method does not have any arguments.  I am writing a program that draws shapes, and I tried this</p>

<pre><code>void drawCircle() const;
</code></pre>

<p>but I have been unable to determine whether the data members remain unchanged.  Thanks</p>
