code-examples-step-by-step/chapter2_roles_flag.tex at master · codingsocialscience/code-examples-step-by-step · GitHub

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\documentclass{beamer}

\usepackage[utf8]{inputenc}
\usepackage{scratch}

\begin{document}

\begin{frame}

\end{frame}

\begin{frame}

  \begin{scratch}
  \blockmove{set variable \ovalvariable{flag} as \txtbox{False}}
  \blockmove{set variable \ovalvariable{looking for} as \txtbox{42}}
  \end{scratch}

\end{frame}


\begin{frame}

  \begin{scratch}
  \blockmove{set variable \ovalvariable{flag} as \txtbox{False}}
  \blockmove{set variable \ovalvariable{looking for} as \txtbox{42}}
  \blockspace
  \blockifelse{ if \booloperator{ \ovalvariable{flag} } }
  {
    \blocklook{print The file has value \ovalvariable{looking for} }
  }{
    \blocklook{print The file does not have value \ovalvariable{looking for} }
  }
  \end{scratch}

\end{frame}

\begin{frame}

  \begin{scratch}
      \blockif{ if \booloperator{ \ovalvariable{number} $==$ \ovalvariable{looking for} } }
      {
        \blockspace
      }
  \end{scratch}

\end{frame}

\begin{frame}

  \begin{scratch}
    \blockif{ if \booloperator{ \ovalvariable{number} $==$ \ovalvariable{looking for} } }
      {
        \blockmove{set variable \ovalvariable{flag} as \txtbox{True} }
      }
  \end{scratch}

\end{frame}

\begin{frame}

  \begin{scratch}
  \blockrepeat{for each \ovalvariable{line} in file \txtbox{example.txt}}
  {
      \blockmove{set variable \ovalvariable{number} as numerical value of \ovalvariable{line}}
      \blockif{ if \booloperator{ \ovalvariable{number} $==$ \ovalvariable{looking for} } }
      {
        \blockmove{set variable \ovalvariable{flag} as \txtbox{True} }
      }
  }
  \end{scratch}

\end{frame}

\begin{frame}

  \begin{scratch}
  \blockmove{set variable \ovalvariable{flag} as \txtbox{False}}
  \blockmove{set variable \ovalvariable{looking for} as \txtbox{42}}
  \blockrepeat{for each \ovalvariable{line} in file \txtbox{example.txt}}
  {
      \blockmove{set variable \ovalvariable{number} as numerical value of \ovalvariable{line}}
      \blockif{ if \booloperator{ \ovalvariable{number} $==$ \ovalvariable{looking for} } }
      {
        \blockmove{set variable \ovalvariable{flag} as \txtbox{True} }
      }
  }
  \blockifelse{ if \booloperator{ \ovalvariable{flag} } }
  {
    \blocklook{print The file has value \ovalvariable{looking for} }
  }{
    \blocklook{print The file does not have value \ovalvariable{looking for} }
  }
  \end{scratch}

\end{frame}

\end{document}