Line numbering using listings package starts at random number

Question

I'm using the listings package to include code directly from a file. In the first instance my code is numbered as I want it 1 at the 1st line, 11 at the 11th, ... However, the second block of code it numbers 2 on the 2nd line, 12 on the 12th line, ... then the first numbering 8 on the 8th line.

Any suggestions on how to fix this?

Here is my code:

\documentclass{article}
\usepackage{listings, color, setspace, graphics}
\usepackage{fancyhdr, amsmath, amssymb, setspace, amssymb}
\usepackage{pdfpages}

\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}

\lstset{ %
  language=C++,                % the language of the code
  basicstyle=\footnotesize,           % the size of the fonts that are used for the code
  numbers=left,                   % where to put the line-numbers
  numberstyle=\tiny\color{gray},  % the style that is used for the line-numbers
  stepnumber=10,                   % the step between two line-numbers. If it's 1, each line 
                                  % will be numbered
  numbersep=5pt,                  % how far the line-numbers are from the code
  backgroundcolor=\color{white},      % choose the background color. You must add \usepackage{color}
  showspaces=false,               % show spaces adding particular underscores
  showstringspaces=false,         % underline spaces within strings
  showtabs=false,                 % show tabs within strings adding particular underscores
  tabsize=2,                      % sets default tabsize to 2 spaces
  captionpos=b,                   % sets the caption-position to bottom
  breaklines=true,                % sets automatic line breaking
  breakatwhitespace=false,        % sets if automatic breaks should only happen at whitespace
  keywordstyle=\color{blue},          % keyword style
  commentstyle=\color{dkgreen},       % comment style
  stringstyle=\color{mauve},         % string literal style
}

\renewcommand{\baselinestretch}{1}
\setlength{\textheight}{9in}
\setlength{\textwidth}{6.5in}

\setlength{\topmargin}{0in}
\setlength{\oddsidemargin}{0in}
\setlength{\evensidemargin}{0in}
\setlength{\parindent}{.3in}

\pagestyle{fancy}

\sloppy
\definecolor{lightgray}{gray}{0.5}
\setlength{\parindent}{0pt}

\begin{document}
\setcounter{page}{11}
\lhead{John Haase}
\chead{AME 60614 Numerical Methods - Homework 2}
\rhead{\thepage}
\cfoot{}

\section*{Problem 1 Source Code}
\subsection*{C++ Code}
\lstset{language=C++}
\lstinputlisting{Problem1/Problem1.cpp}
\clearpage

\section*{Problem 2 Source Code}
\subsection*{C++ Code}
\lstset{language=C++}
\lstinputlisting{Problem2/Problem2.cpp}
\clearpage

\subsection*{MATLAB Code}
\lstset{language=Matlab}
\lstinputlisting{Problem2/Problem2.cpp}
\clearpage

\end{document}

Answer 1

If you want the more usual format of listings and number every to 10th line, you need to include the option firstnumber=1 so that each listing begins from 1. If you also want the first line numbered, then you need the option numberfirstline=true.

Here is a before and after comparrison:

Notes:

• This appears to only be necessary if stepnumber is set to something other than 1.
• Your code will work without this change, but I also removed the language setting form the initial ltset and specified the language as part of the optional parameter to \lstinputlisting (instead of using lstset). I think this more clearly captures the intent of what you want.

Code:

\documentclass{article}
\usepackage{listings, color, setspace, graphics}
\usepackage{fancyhdr, amsmath, amssymb, setspace, amssymb}
\usepackage{pdfpages}

\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}

\usepackage{filecontents}
\begin{filecontents*}{Problem1.cpp}
A1
B1
C1
D1
E1
F1
G1
A1
B1
C1
D1
E1
F1
G1
\end{filecontents*}
\begin{filecontents*}{Problem2.cpp}
A2
B2
C2
D2
E2
F2
G2
A2
B2
C2
D2
E2
F2
G2
\end{filecontents*}
\begin{filecontents*}{Problem3.cpp}
A3
B3
C3
D3
E3
F3
G3
A3
B3
C3
D3
E3
F3
G3
A3
B3
C3
D3
E3
F3
G3
A3
B3
C3
D3
E3
F3
G3
\end{filecontents*}


\lstset{%
%  language=C++,                % the language of the code
  basicstyle=\footnotesize,           % the size of the fonts that are used for the code
  numbers=left,                   % where to put the line-numbers
  numberstyle=\tiny\color{gray},  % the style that is used for the line-numbers
  stepnumber=10,                   % the step between two line-numbers. If it's 1, each line 
                                  % will be numbered
  numbersep=5pt,                  % how far the line-numbers are from the code
  backgroundcolor=\color{white},      % choose the background color. You must add \usepackage{color}
  showspaces=false,               % show spaces adding particular underscores
  showstringspaces=false,         % underline spaces within strings
  showtabs=false,                 % show tabs within strings adding particular underscores
  tabsize=2,                      % sets default tabsize to 2 spaces
  captionpos=b,                   % sets the caption-position to bottom
  breaklines=true,                % sets automatic line breaking
  breakatwhitespace=false,        % sets if automatic breaks should only happen at whitespace
  keywordstyle=\color{blue},          % keyword style
  commentstyle=\color{dkgreen},       % comment style
  stringstyle=\color{mauve},         % string literal style
  %
  firstnumber=1, numberfirstline=true,% <------- newly ad added lines
}

\renewcommand{\baselinestretch}{1}
\setlength{\textheight}{9in}
\setlength{\textwidth}{6.5in}

\setlength{\topmargin}{0in}
\setlength{\oddsidemargin}{0in}
\setlength{\evensidemargin}{0in}
\setlength{\parindent}{.3in}

\pagestyle{fancy}

\sloppy
\definecolor{lightgray}{gray}{0.5}
\setlength{\parindent}{0pt}

\begin{document}
%\setcounter{page}{11}
\lhead{John Haase}
\chead{AME 60614 Numerical Methods - Homework 2}
\rhead{\thepage}
\cfoot{}

\section*{Problem 1 Source Code}
\subsection*{C++ Code}
%\lstset{language=C++}
\lstinputlisting[language=C++]{Problem1.cpp}
\clearpage

\section*{Problem 2 Source Code}
\subsection*{C++ Code}
%\lstset{language=C++}
\lstinputlisting[language=C++]{Problem2.cpp}
\clearpage

\subsection*{MATLAB Code}
%\lstset{language=Matlab}
\lstinputlisting[language=Matlab]{Problem3.cpp}
\clearpage

\end{document}