How to remove weird symbol

Question

Hello from this question

C++ code, change the font

the first answer has given the code

\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}
\colorlet{mygray}{black!30}
\colorlet{mygreen}{green!60!blue}
\colorlet{mymauve}{red!60!blue}
\lstset{
  backgroundcolor=\color{gray!10},

  basicstyle=\ttfamily,
  columns=fullflexible,
  breakatwhitespace=false,

  breaklines=true,

  captionpos=b,

  commentstyle=\color{mygreen}, 
  extendedchars=true,

  frame=single,

  keepspaces=true,

  keywordstyle=\color{blue},

  language=c++,

  numbers=none,

  numbersep=5pt,

  numberstyle=\tiny\color{blue}, 
  rulecolor=\color{mygray},

  showspaces=false,

  showtabs=false,

  stepnumber=5,

  stringstyle=\color{mymauve},

  tabsize=3,

  title=\lstname

}
\begin{document}
\begin{lstlisting}
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>
int main()
{
    char *outText;
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
// Initialize tesseract-ocr with English, without specifying tessdata path
if (api-&gt;Init(NULL, &quot;eng&quot;)) {
    fprintf(stderr, &quot;Could not initialize tesseract.\n&quot;);
    exit(1);
}

// Open input image with leptonica library
Pix *image = pixRead(&quot;/usr/src/tesseract/testing/phototest.tif&quot;);
api-&gt;SetImage(image);
// Get OCR result
outText = api-&gt;GetUTF8Text();
printf(&quot;OCR output:\n%s&quot;, outText);

// Destroy used object and release memory
api-&gt;End();
delete [] outText;
pixDestroy(&amp;image);

return 0;

}
\end{lstlisting}
\end{document}

But when compiling the program in the printing part the output looks weird as below

How do I remove that weird symbol between the letters?

Answer 1

listings supports explicitly showing spaces in strings. You can deactivate this using showstringspaces=false (see the line with <- ADDED):

\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}
\colorlet{mygray}{black!30}
\colorlet{mygreen}{green!60!blue}
\colorlet{mymauve}{red!60!blue}
\lstset{
  backgroundcolor=\color{gray!10},

  basicstyle=\ttfamily,
  columns=fullflexible,
  breakatwhitespace=false,

  breaklines=true,

  captionpos=b,

  commentstyle=\color{mygreen}, 
  extendedchars=true,

  frame=single,

  keepspaces=true,

  keywordstyle=\color{blue},

  language=c++,

  numbers=none,

  numbersep=5pt,

  numberstyle=\tiny\color{blue}, 
  rulecolor=\color{mygray},

  showspaces=false,

  showstringspaces=false, % <- ADDED
  showtabs=false,

  stepnumber=5,

  stringstyle=\color{mymauve},

  tabsize=3,

  title=\lstname

}
\begin{document}
\begin{lstlisting}
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>
int main()
{
    char *outText;
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
// Initialize tesseract-ocr with English, without specifying tessdata path
if (api-&gt;Init(NULL, &quot;eng&quot;)) {
    fprintf(stderr, &quot;Could not initialize tesseract.\n&quot;);
    exit(1);
}

// Open input image with leptonica library
Pix *image = pixRead(&quot;/usr/src/tesseract/testing/phototest.tif&quot;);
api-&gt;SetImage(image);
// Get OCR result
outText = api-&gt;GetUTF8Text();
printf(&quot;OCR output:\n%s&quot;, outText);

// Destroy used object and release memory
api-&gt;End();
delete [] outText;
pixDestroy(&amp;image);

return 0;

}
\end{lstlisting}
\end{document}

Result: