fontslistings
So I am adding some C++ code snippets in my document using
\lstset {language=C++}
\begin{lstlisting}
for (int i=0; i<iterations;i++)
{
do something
}
\end{lstlisting}
My issue is that the font in the code appears different and apparently bigger than the other normal text of the document.Is it supposed to be like this or if not how can I specify a specific size for the font.Also is there a way were I can have a light background for the code something like what I have for the code above?
There's nothing quite so simple. However, you can give your own macro as the argument to identifierstyle and that can examine the \lst@token token list to see if the list starts with an uppercase letter. I'm not sure how robust this solution is though.
\lstset{identifierstyle=\idstyle}
\makeatletter
\newcommand*\idstyle{%
\expandafter\id@style\the\lst@token\relax
}
\def\id@style#1#2\relax{%
\ifcat#1\relax\else
\ifnum`#1=\uccode`#1%
\bfseries
\fi
\fi
}
\makeatother
I only tested it on the QuickSort example on Wikipedia.
This answer is slightly difficult to figure out exactly what it's doing so let me try to explain. The listings package will use the execute the \idstyle macro whenever it is trying to typeset an identifier and the actual text will be in the \lst@token token register. So all \idstyle does is it expands the token register using \the\lst@token and then \id@style will expand.
\is@style has a delimited argument (#2) which will scoop up every thing up to the \relax token. That is, #1 will contain the first token and #2 will contain all of the rest. Then, the category code of #1 will be compared to that of \relax. This is true if #1 is a control sequence and false otherwise. The second if checks that the token matches its own uppercase code; that is, it checks if the token is an uppercase character. If it is, then \bfseries executes.
Use the tcolorbox package, which uses the listings package, but has better support for effects.
This is what a MWE is:
\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{listings}
\begin{document}
\begin{tcblisting}{colback=black,coltext=green}
This is a \LaTeX\ example which displays the text as source code
and in compiled form.
\end{tcblisting}
\end{document}
The package has recently been updated to include English documentation, so you might need to update your distribution. The dotted line in the middle can be removed if you don't use the output frame with the listing only option.
Best Answer
This is what you could have found out with the manual too and maybe faster than posting your question here ;-)
If this doesn't answer your question(s) please provide a full working minimal example which illustrates your problem and maybe you can describe the problem more precisely.