title: Commonly Accepted Variable Name Formatting - C/C++
body: <p>I realize that this can be a matter of preference, but I have noticed that variables names in a lot of code samples I've seen have a prefix of <code>g_</code>, <code>s_</code>, <code>m_</code>, or just <code>_</code>.  Is this a commonly accepted practice, and what do these prefixes mean?  Are there any others that would be good to know?</p>