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    \title{Chapitre 7 : Tableaux - TD}
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    \subsection*{Exercice 1 : Test de compréhension}
    \subsubsection*{Question 1 : Définition et affichage }
    

\begin{itemize}
  \tightlist
  \item Définir un tableau
contenant les jours de la
semaine
\item
  Afficher le premier et le dernier élément
\end{itemize}

    \subsubsection*{Question 2 : Indice et
valeur}\label{question-2-indice-et-valeur}

\begin{itemize}
\tightlist
\item
  Qu'est-ce que l'\emph{indice} d'un élément ? quelles valeurs peut-il
  prendre ?
\item
  Quelle différence entre l'\emph{indice} d'un élément et sa
  \emph{valeur} ?
\end{itemize}

    \subsubsection*{Question 3 : Nombre
d'éléments}\label{question-3-nombre-duxe9luxe9ments}

Comment connaître le nombre d'éléments d'un tableau ?

    \subsubsection*{Question 4 : Affichage}\label{question-4-affichage}

\begin{itemize}
\tightlist
\item
  Afficher les jours de la \texttt{semaine} précédés du numéro du jour
\item
  Inverser l'ordre d'affichage : commencer par le dimanche et finir par
  le lundi
\end{itemize}

\subsubsection*{Question 5 : Affichage
compact}\label{question-5-affichage-compact}

\begin{itemize}
\tightlist
\item
  Afficher les jours de la semaine sur une ligne, séparés par des
  obliques \texttt{/}.
\end{itemize}

    \subsection*{Exercice 2 : Alias et
modifications*}\label{exercice-2-alias-et-modifications}

    Que valent \texttt{t1}, \texttt{t2}, \texttt{t3} à la fin du programme ?

    \begin{Verbatim}[commandchars=\\\{\}]
{\color{incolor}In [{\color{incolor} }]:} t1 = [\PYZsq{}a\PYZsq{}, \PYZsq{}b\PYZsq{}, \PYZsq{}c\PYZsq{}, \PYZsq{}d\PYZsq{}]
        t2 = [34, 31, 957]
        t3 = t1
        t3[1] = \PYZhy{}3
        t1 = t2
        t2[0] = \PYZsq{}abc\PYZsq{}
        t2[0] = \PYZsq{}bonjour\PYZsq{}
        t3[2] = \PYZsq{}oui\PYZsq{}
        
        print(t1)
        print(t2)
        print(t3)
\end{Verbatim}


    \subsection*{Exercice 3 : Somme*}\label{exercice-3-somme}

Mettre dans un tableau les nombres \texttt{5,\ 6,\ 8,\ 14,\ 17}.
Calculer et afficher leur somme.

    \subsection*{Exercice 4 : Maximum*}\label{exercice-4-maximum}

Écrire un programme qui recherche le plus grand élément d'un tableau
donné. Par exemple avec \texttt{{[}32,\ 5,\ 12,\ 8,\ 3,\ 75,\ 2{]}} il
doit afficher \texttt{le\ max\ est\ 75}.

    \subsection*{Exercice 5 : Saisie de
notes**}\label{exercice-5-saisie-de-notes}

Écrire un programme qui permet de saisir des notes d'étudiants et les
enregistrer dans un tableau. La saisie s'arrête quand on saisit un
nombre hors de l'intervalle {[}0,20{]}. Afficher alors le tableau s'il
n'est pas vide.

    \subsection*{Exercice 6 : Écriture/Lecture dans un
fichier*}\label{exercice-9-uxe9criturelecture-dans-un-fichier}

Définir un programme qui écrit dans un fichier tous les entiers
inférieurs à 10 000. Chaque entier est sur une ligne différente du
fichier. Puis faire un programme qui lit le contenu de ce fichier et
mémorise toutes les valeurs dans un tableau.

Refaire la même chose mais cette fois-ci tous les entiers sont sur une
même ligne et sont séparés par un \texttt{;}.


 \section*{Pour aller plus loin}\label{pour-aller-plus-loin}


    \subsection*{Exercice 7 : Purge de
zéros**}\label{exercice-6-purge-de-zuxe9ros}

Écrire un programme qui crée un tableau à partir d'un autre en omettant
les zéros. Essayer sur

\begin{verbatim}
x = [34, -2, 0, 39, 0, 78, 0, 0, 46]
\end{verbatim}

    \subsection*{Exercice 8 : Chaînes et
tableaux**}\label{exercice-7-chauxeenes-et-tableaux}

\begin{itemize}
\tightlist
\item
  Créer à partir d'une chaîne de caractères \texttt{s} un tableau
  \texttt{t} ayant pour éléments les caractères de \texttt{s}
\item
  Créer une chaîne \texttt{s2} dont les caractères sont les éléments de
  \texttt{t}. Qu'en dire ?
\end{itemize}

    \subsection*{Exercice 8 : Remplacement de certains
caractères**}\label{exercice-8-remplacement-de-certains-caractuxe8res}

Saisir une chaîne et l'afficher en remplaçant les lettres \texttt{a} et
\texttt{e} par un tiret.

\noindent Par exemple sur \texttt{"il\ fait\ beau"} on
doit afficher

\texttt{il\ f-it\ b-\/-u}.



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