Cannot write my pseudocodes in IEEE Access format?

Question

I am trying to write an IEEE Access paper by using the template on their website. But I am having trouble writing my pseudocodes since there is no pseudocode example in their template. When I use ieeeaccess template I got error messages such as:

"Extra \endcsname. \State",

"Undefined control sequence. \doWhile",

"Missing \endcsname inserted. \State".

Also, the result does not look as it should be. For instance, all line numbers are zeros in the pseudocode. Also instead of "input" and "output", I got "require" and "ensure" after compiling the .tex file.

Am I missing some userpackage?(although I have tried many combinations still no results) Can someone please give me an example of ieeeaccess pseudocode along with the required userpackages?

\documentclass{ieeeaccess}
\usepackage{cite}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage[section]{placeins}
\usepackage{algorithm}
 \usepackage{algpseudocode}
 \usepackage{algorithmicx}
 \algdef{SE}[DOWHILE]{Do}{doWhile}{\algorithmicdo}[1]{\algorithmicwhile\ #1}%

\begin{document}
\begin{algorithm}[H]    
    \caption{Algorithm 1}\label{Alg-Decap}
    \begin{algorithmic}[1]
        \Require{$(C,S_k)$}
        \Ensure{ HashSession$(1,\underbar r,C)$ or HashSession$(0,\rho,C))$ }
        \State $c\leftarrow$ Decode$(\underbar c)$  
        \State $c.(3f)\in\mathcal{R}/q$
        \State $e\leftarrow $ (Rounded$(c.(3f))$ mod 3) $\in \mathcal{R}/3$
        \State $e.(1/g)\in\mathcal{R}/3$
        \State $r'\leftarrow$ Lift($e.(1/g)$) $\in\mathcal{R}/q$
        \State $h.r'\in\mathcal{R}/q$
        \State $c'\leftarrow$ Round$(h.r')$
        \State  $\underbar c'\leftarrow$ Encode$(c')$
        \State $C'\leftarrow(\underbar c',$ HashConfirm$(\underbar r',\underbar h))$
        \If{$C'==C$}
        \State \textbf{return} HashSession$(1,\underbar r,C)$
        \Else
        \State \textbf{ return} HashSession$(0,\rho,C))$
        \EndIf
    \end{algorithmic}
\end{algorithm}
\end{document}

Answer 1

You must not load both algorithmic and algpseudocode. Since you're using the latter's syntax, drop the former.

If you want Input and Output, define the infrastructure for them.

Also, don't go in and out of math mode and don't use \underbar, but \underline.

\documentclass{ieeeaccess}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{algorithm}
\usepackage{algpseudocode}

\algdef{SE}[DOWHILE]{Do}{doWhile}{\algorithmicdo}[1]{\algorithmicwhile\ #1}%
\algnewcommand\algorithmicinput{\textbf{Input:}}
\algnewcommand\algorithmicoutput{\textbf{Output:}}
\algnewcommand\Input{\item[\algorithmicinput]}
\algnewcommand\Output{\item[\algorithmicoutput]}

% no in and out of math mode!
\newcommand{\Fun}[1]{\mathrm{#1}}

\begin{document}

\begin{algorithm}[htp]

\caption{Algorithm 1}\label{Alg-Decap}

\begin{algorithmic}[1]
  \Input{$(C,S_k)$}
  \Output{$\Fun{HashSession}(1,\underbar r,C)$ or $\Fun{HashSession}(0,\rho,C))$}
  \State $c\leftarrow \Fun{Decode}(\underbar c)$
  \State $c.(3f)\in\mathcal{R}/q$
  \State $e\leftarrow (\Fun{Rounded}(c.(3f))\bmod 3)\in \mathcal{R}/3$
  \State $e.(1/g)\in\mathcal{R}/3$
  \State $r'\leftarrow \Fun{Lift}(e.(1/g)) \in\mathcal{R}/q$
  \State $h.r'\in\mathcal{R}/q$
  \State $c'\leftarrow \Fun{Round}(h.r')$
  \State $\underline{c}'\leftarrow \Fun{Encode}(c')$
  \State $C'\leftarrow(\underline{c}', \Fun{HashConfirm}(\underline{r}',\underline{h}))$
  \If{$C'==C$}
  \State \textbf{return} $\Fun{HashSession}(1,\underline{r},C)$
  \Else
  \State \textbf{return} $\Fun{HashSession}(0,\rho,C))$
  \EndIf
\end{algorithmic}

\end{algorithm}

\EOD

\end{document}