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\documentclass{article}
\usepackage{algorithm}% http://ctan.org/pkg/algorithms
\usepackage{algpseudocode}% http://ctan.org/pkg/algorithmicx
\begin{document}
% https://tex.stackexchange.com/questions/229355/algorithm-algorithmic-algorithmicx-algorithm2e-algpseudocode-confused
% https://en.wikibooks.org/wiki/LaTeX/Algorithms
\begin{algorithm}
\caption{Naive byte array to DNA encode}
\begin{algorithmic}[1]
\Procedure{EncodeToDNASequence}{$name$}
\State $fp\gets open(name)$
\State $en\gets null$
\While{$fp\not=EOF$}
\State $c\gets buf[0]$\Comment{Read 1 byte from buffer}
\State $b\gets sprintf("08b", c)$\Comment{Convert to string binary}
\For{\texttt{e in range[0,2,4,6]}}
\If {$e[0] = 48$ $1$ and $e[1] = 48$}\Comment{0x00 - A (Adenine)}
\State $en\gets en + `A`$
\EndIf
\If {$e[0] = 48$ $1$ and $e[1] = 49$}\Comment{0x01 - G (Guanine)}
\State $en\gets en + `G`$
\EndIf
\If {$e[0] = 49$ $1$ and $e[1] = 48$}\Comment{0x10 - C (Cytosine)}
\State $en\gets en + `C`$
\EndIf
\If {$e[0] = 49$ $1$ and $e[1] = 49$}\Comment{0x11 - T (Thymine)}
\State $en\gets en + `T`$
\EndIf
\EndFor
\EndWhile
\State \textbf{return} $en$\Comment{Return string DNA sequence}
\EndProcedure
\end{algorithmic}
\end{algorithm}
%\begin{algorithm}
%\caption{Euclid’s algorithm}\label{euclid}
%\begin{algorithmic}[1]
%\Procedure{Euclid}{$a,b$}\Comment{The g.c.d. of a and b}
% \State $r\gets a\bmod b$
% \While{$r\not=0$}\Comment{We have the answer if r is 0}
% \State $a\gets b$
% \State $b\gets r$
% \State $r\gets a\bmod b$
% \EndWhile\label{euclidendwhile}
% \State \textbf{return} $b$\Comment{The gcd is b}
%\EndProcedure
%\end{algorithmic}
%\end{algorithm}
\end{document}
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