\usepackage{listings}
\lstloadlanguages{c}
\newcommand{\ccomment}{\color[rgb]{0.2,0.3,0.1}}
\newcommand{\cidentifier}{\color[rgb]{0.1,0.1,0.5}}
\newcommand{\lstcolor}{\color[rgb]{0.6,0.6,0.6}}
% 
\lstset{
    basicstyle=\tiny,
    identifierstyle=\cidentifier,
    keywordstyle=\fontfamily{pcr}\bfseries,
    commentstyle=\ccomment\itshape\tiny,
    frame=single,
    tabsize=2,
    rulecolor=\lstcolor,
    sensitive = false,
    captionpos=b,
    showstringspaces=false,
    breaklines=true,
    frameround=tttt,
    numbers=left,
    language=c,
}