Algorithm environments in LaTeX

% Put this in your preamble
\usepackage{algorithm, algpseudocode}

% ----
% Put this in the desired chapter

\begin{algorithm}
\caption{(1+1) Evolutionary Algorithm}
\label{alg:1-1EA}
\begin{algorithmic}[1]
    \State $p_m \gets 1/n$ \Comment{Set probability of mutation}\tabularnewline
    \State Choose randomly an initial bit string $x \in \{0,1\}^n$
    \While{Stopping criteria not satisfied}
        \State Compute $x'$ by flipping independently each bit $x_i$ with probability $p_m$
        \State Replace $x$ by $x'$ iff $f(x') \geq f(x)$
    \EndWhile
\end{algorithmic}
\end{algorithm}