LaTeX Forum

\documentclass{scrartcl}

\makeatletter
\let\c@table\c@figure
\makeatother

\renewcommand{\thetable}{\arabic{section}.\arabic{table}}
\renewcommand{\thefigure}{\arabic{section}.\arabic{figure}}

\begin{document}
\section{test}
\begin{figure}
\caption{blub}
\end{figure}

\begin{table}
\caption{blabla}
\end{table}

\begin{figure}
\caption{blub}
\end{figure}

\begin{table}
\caption{blabla}
\end{table}
\end{document}

\documentclass[ngerman]{scrartcl}

\usepackage{babel}
\usepackage{mwe}

% Findest du im scrguide
\renewcommand*{\figureformat}{%
% Nummer von figure=table, danach figure um eins erhöhen.
\setcounter{figure}{\value{table}}\stepcounter{figure}%
\figurename~\arabic{section}.\arabic{figure}\autodot} 

\renewcommand*{\tableformat}{%
% Zuerst Nummer table= figure, dann table erhöhen.
\setcounter{table}{\value{figure}}\stepcounter{table}%
\tablename~\arabic{section}.\arabic{table}\autodot}

\begin{document}

\begin{figure}[htb] %  figure placement: here, top, bottom, or page
   \centering
   \includegraphics[width=0.5\textwidth]{example-image-a} 
   \caption{example caption}
   \label{fig:example}
\end{figure}

\begin{table}[h] 
\centering 
\caption{blabla} 
\begin{tabular}{ c | c } 
Algorithmus & Kompetitivität\\ 
\hline 
\hline 
$NB$ & --\\ 
..... 
\end{tabular} 
\end{table}

\begin{figure}[htb] %  figure placement: here, top, bottom, or page
   \centering
   \includegraphics[width=0.5\textwidth]{example-image-a} 
   \caption{example caption}
   \label{fig:example}
\end{figure}

\end{document}