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   "source": [
    "# Boucles : Exercices en Python"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 1\n",
    "\n",
    "Voici un petit programme:"
   ]
  },
  {
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   "execution_count": null,
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   "outputs": [],
   "source": [
    "n=5\n",
    "while n>0 :\n",
    "    print(n)\n",
    "    n=n-1\n",
    "print(\"Feu !\")\n",
    "print(n)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "L'utilisation de la structure `while` vous semble-t-elle pertinente ?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 2\n",
    "\n",
    "Écrire ci-dessous un programme qui permet d'afficher **Bonjour** 20 fois."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 3\n",
    "\n",
    "Écrire un script qui affiche les $n$ premiers nombres entiers les uns en dessous des autres."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 4\n",
    "Écrire un script qui affiche les nombres impairs inférieurs ou égaux à $n$ les uns en dessous des autres."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 5\n",
    "\n",
    "Écrire un script qui dessine un triangle comme ci-dessous à $n$ lignes. \n",
    "\n",
    "**Rappel**\n",
    "\n",
    "\"a\"+\"b\"=\"ab\" et \"a\"*3=\"aaa\".\n",
    "\n",
    "**Figure attendue**\n",
    "\n",
    "```\n",
    "*\n",
    "**\n",
    "***\n",
    "****\n",
    "*****\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 6\n",
    "\n",
    "Écrire un script qui dessine un triangle comme ci-dessous à $n$ lignes et qui affiche en dessous le nombre total d'étoiles.\n",
    "\n",
    "```\n",
    "*****\n",
    "****\n",
    "***\n",
    "**\n",
    "*\n",
    "\n",
    "Il y a 15 étoiles\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 7 : Baballe\n",
    "\n",
    "Une balle chute de 400 pixels. A chaque rebond , la hauteur de la balle diminue de d10%.\n",
    "Réalisez un programme qui affiche la hauteur de chaque rebond tant qu'ils sont supérieurs à 5 pixels. Afficher le nombre de rebonds nécessaires pour avoir une hauteur inférieure à 5 pixels."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 8 Une histoire de prix...\n",
    "\n",
    "Au premier janvier 2020, le prix d'une voiture est de 18 960 euros.\n",
    "Chaque année, la valeur de cette voiture diminue de 20%.\n",
    "On souhaite écrire un programme qui calcule le nombre d'années au bout duquel la valeur de cette voiture passe sous le seuil de 2 000 euros."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 9\n",
    "\n",
    "Écrire un programme qui affiche un joli sapin de Noël, dont la taille est donnée par l’utilisateur.\n",
    "\n",
    "**Figure attendue** pour une taille de 12 lignes\n",
    "\n",
    "```\n",
    "              ^\n",
    "             ^^^\n",
    "            ^^^^^\n",
    "           ^^^^^^^\n",
    "          ^^^^^^^^^\n",
    "         ^^^^^^^^^^^\n",
    "        ^^^^^^^^^^^^^\n",
    "       ^^^^^^^^^^^^^^^\n",
    "      ^^^^^^^^^^^^^^^^^\n",
    "     ^^^^^^^^^^^^^^^^^^^\n",
    "    ^^^^^^^^^^^^^^^^^^^^^\n",
    "   ^^^^^^^^^^^^^^^^^^^^^^^\n",
    "```"
   ]
  },
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