Cfrgtkky

I have a question about showing C++ code in LateX

When I do the following, the C++ goes past the page. Is there a way to fix this?

documentclass{article} 



newcommand{dd}[1]{mathrm{d}#1}

usepackage[parfill]{parskip}

usepackage{listings}

usepackage{xcolor} % for setting colors

usepackage{breqn}



% set the default code style

lstset{

    frame=tb, % draw a frame at the top and bottom of the code block

    tabsize=4, % tab space width

    showstringspaces=false, % don't mark spaces in strings

    numbers=left, % display line numbers on the left

    commentstyle=color{green}, % comment color

    keywordstyle=color{blue}, % keyword color

    stringstyle=color{red} % string color

}



begin{document}



section{$Delta A_2$ Derivation: Comparison with CRIS2}





First, let us start by showing the C++ code:

begin{lstlisting}[language=C++, caption={C++ code using listings}]

{

  else if (evaltype == 5) 

  {

    for (std::size_t i=startp;i<p.size();++i) 

    {

      double & x = p[i].first; //input

      double & y = p[i].second; //result

      double q1 = rtx[8]-(cafdf(rtx[0],rtx[4]*x*x*x)-rtx[3])/rtx[1];

      double xi = crsxib(q1); 

      double p1i = 23.0/(1.0-xi)+ab[5]+xi*(11.0*ab[2]+xi*(2.0*ab[3]+xi*33.0*ab[4]));

      p1i *= 4.3723240245*ab[0];

      double si = (1.0+ci*(ab[99]+xi*(ab[44]+xi*ab[33])))/(3.0*(1.0-xi));

      y = p1i*xi*xy/abc[2]/dde[2]*(x/(1.0+dd*(x-1.0)))*(q/(1.0+si*(x-1.0)))*(x/(1.0+ci*(x-1.0)));

    }

  }

}

end{lstlisting}

Please in your lstset add breaklines = true, then with

begin{lstlisting}[language=C++, caption={C++ code using listings}]

{

  else if (evaltype == 5) 

  {

    for (std::size_t i=startp;i<p.size();++i) 

    {

      double & x = p[i].first; //input

      double & y = p[i].second; //result

      double q1 = rtx[8]-(cafdf(rtx[0],rtx[4]*x*x*x)-rtx[3])/rtx[1];

      double xi = crsxib(q1); 

      double p1i = 23.0/(1.0-xi)+ab[5]+xi*(11.0*ab[2]+xi*(2.0*ab[3]+xi*33.0*ab[4]));

      p1i *= 4.3723240245*ab[0];

      double si = (1.0+ci*(ab[99]+xi*(ab[44]+xi*ab[33])))/(3.0*(1.0-xi));

      y = p1i*xi*xy/abc[2]/dde[2]*(x/(1.0+dd*(x-1.0)))*(q/(1.0+si*(x-1.0)))*(x/(1.0+ci*(x-1.0)));

    }

  }

}

end{lstlisting}

You will see