I've been using the listings package for a while, but have only recently noticed that the underscore is rendered with less width than the other characters. I'm working on some code snippets now which use a lot of variables containing an underscore, and so I see the effect more than ever. Is there any way to prevent this?
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1Related Question: Getting incorrect underscores from macro in an lstlisting. – Peter Grill Nov 17 '12 at 5:35
Say
\usepackage[T1]{fontenc}
in your preamble. The default underscore in OT1 encoding is indeed quite small.
If you don't want to switch font encoding, then the following code in the preamble will produce a similar underscore:
\makeatletter
\DeclareTextCommandDefault{\textunderscore}{%
\leavevmode\kern0.03em\vbox{\hrule\@width.6em \@height-.25ex \@depth0.37ex}\kern0.03em}
\makeatother
