\listfiles
\documentclass[]{article}
\usepackage{listings}
\usepackage{xcolor}
\lstloadlanguages{C}
\lstset{%
language=C,
showstringspaces=false,
basicstyle=\ttfamily\small,
keywordstyle=\color{red},
commentstyle=\color{blue},
stringstyle=\color{green}
}%
\begin{document}
\lstinputlisting[caption=\
{Mein Listing}]{\
fragment.c}
\end{document}