How do you display straight quotes instead of curly quotes when using LaTeX's 'listings' package?

Answer 1

I see in the documentation (which should have been distributed with the packge, but is available at http://www.ctan.org/tex-archive/macros/latex/contrib/listings/listings.pdf) for listings that there is a settable property called upquote to take care of this.

From the documentation:

upquote=⟨true|false⟩                                                false
  determines whether the left and right quote are printed ‘’ or `'. This 
  key requires the textcomp package if true.

Do something like

\lstset{upquote=true}

before begining the list environment, or use

\begin{lstlisting}[upquote=true]
...
\end{lstlisting}

---

It is also possible that tis property is already set for you in the appropriate language definition (see the docs again, big list of predefined languages on page 12).

Use:

\lstloadlanguages{<dialects you need>}

in the header. And then set the language using either of the above conventions for choosing options.

Answer 2

dmckee's answer above probably works. If you drop your last condition, i.e. you permit changes to the code, then there is a more generic solution, which I tend to use whenever (La)TeX renders a character somehow differently than I expect it to do is to use the \symbol command. I list it here because it can be useful in other situations as well:

\newcommand{\qq}{\symbol{34}} % 34 is the decimal ascii code for "

And then your example:

\begin{lstlisting}
...
print{\qq}The temperature is{\qq},Celsius,{\qq}degrees Celsius{\qq}
...
\end{lstlisting}

Note the curly braces which supposedly take listings back to LaTeX mode (see escapechars option of the package.)

Answer 3

Have you considered using a monospaced (typewriter) font for the listing? The following example works:

\documentclass{article}
\usepackage{listings}
\lstset{basicstyle=\ttfamily} % <<< This line added
\begin{document}
\begin{lstlisting}
Fahrenheit=input("What is the Fahrenheit temperature?")
Celsius=(5.0/9.0)*(Fahrenheit-32)
print"The temperature is",Celsius,"degrees Celsius"
\end{lstlisting}
\end{document}

Answer 4

Maybe it's because I installed listings early as a LaTeX user, but I'm surprised to learn that without the listings package the behaviour is any different.

My solution was similar to David Hanak's, but I used the symbols for double-quote as described in the LaTeX Cheat Sheet (http://stdout.org/~winston/latex)

\newcommand{\QQ}[1]{``#1''}

Answer 5

Here is a solution

\usepackage[T1]{fontenc}  
\usepackage{textcomp}  
\usepackage{lmodern}  

% in the listings package configuration, try:  
literate={"}{\textquotedbl}1,