\documentclass{IEEEtran}
\usepackage{algorithm,algorithmic}
\begin{document}
 \begin{algorithm}
 \caption{Algorithm for ...}
 \begin{algorithmic}[1]
 \renewcommand{\algorithmicrequire}{\textbf{Input:}}
 \renewcommand{\algorithmicensure}{\textbf{Output:}}
 \REQUIRE in
 \ENSURE  out
 \\ \textit{Initialisation} :
  \STATE first statement
 \\ \textit{LOOP Process}
  \FOR {$i = l-2$ to $0$}
  \STATE statements..
  \IF {($i \ne 0$)}
  \STATE statement..
  \ENDIF
  \ENDFOR
 \RETURN $P$ 
 \end{algorithmic} 
 \end{algorithm}

\end{document}