How to get rid of the unwanted control information in Solidity listing displayed as figure

Question

I am using dissertation template. Following is the link:

https://www.overleaf.com/read/yyjwyqtvzfwt#ef4aff

Can anybody get access to all my documents using the above link?

I am trying to represent the Solidity code listing as figures. I have written the following code listing for representing as a figure as shown below:

\begin{figure}
  \caption{Example of Information Flow Rules}
\begin{lstlisting}
[language=Solidity, label={lst:Etahinter1}]
contract IFR{
function initOwner(address _owner) public { owner = _owner;}
function EasyTokill() public {
   if (msg.sender == owner)
   { /* sensitive code like selfdestruct or Ether transfer statement */ ... }}
}
\end{lstlisting}
\end{figure}

The resultant latex listing shows the following unwanted line at the top sometimes and sometimes not:

[language=Solidity, label={lst:Etahinter1}]

Please guide me how to get rid of the above line. Zulfi.

Answer 1

The optional argument needs to be straight after \begin{listing} otherwise it is read verbatim as part of the listing.

This is shown in the second block below, but I get

! Package Listings Error: Couldn't load requested language.

See the Listings package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.20 ...language=Solidity, label={lst:Etahinter2}]
                                                  
? 

! Package Listings Error: language solidity undefined.

See the Listings package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.20 ...language=Solidity, label={lst:Etahinter2}]
                                                  
? 

But perhaps you have a local extension that defines this listings configuration.

\documentclass{article}

\usepackage{listings}

\begin{document}
\begin{figure}
  \caption{Example of Information Flow Rules}
\begin{lstlisting}
[language=Solidity, label={lst:Etahinter1}]
contract IFR{
function initOwner(address _owner) public { owner = _owner;}
function EasyTokill() public {
   if (msg.sender == owner)
   { /* sensitive code like selfdestruct or Ether transfer statement */ ... }}
}
\end{lstlisting}

\bigskip \hrule \bigskip

\begin{lstlisting}[language=Solidity, label={lst:Etahinter2}]
contract IFR{
function initOwner(address _owner) public { owner = _owner;}
function EasyTokill() public {
   if (msg.sender == owner)
   { /* sensitive code like selfdestruct or Ether transfer statement */ ... }}
}
\end{lstlisting}
\end{figure}
\end{document}