sq_01_python_intro/jupyter_book/04_bedingungen_variablen.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "c17b2056-f461-4edd-bcbc-c53a1e8aafe4",
   "metadata": {},
   "source": [
    "# Bedinungen & Variablen\n",
    "## Bedingungen\n",
    "\n",
    "Achtet auf Doppelpunkte und Einrückung!"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "ac3cb812-7fb5-40ed-9328-864d9dd7a1b8",
   "metadata": {},
   "outputs": [],
   "source": [
    "def my_min(a, b):\n",
    "    if a < b:\n",
    "        return a\n",
    "    else:\n",
    "        return b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "be0a975d-2fb9-4be2-ad94-46de2819c72f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "-5"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "my_min(-2, -5)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e1f7fc12-e2e3-4c7e-a949-61d3ca9360dc",
   "metadata": {},
   "source": [
    "## Kommentare\n",
    "\n",
    "Programme können durch Kommentare leichter verstanden werden.\n",
    "\n",
    "    \"\"\" Das ist ein\n",
    "        mehrzeiliger\n",
    "        Kommentar \"\"\"\n",
    "    \n",
    "    sin(0) # Kommentar bis Ende der Zeile\n",
    "    \n",
    "ℹ️ Vernünftige Funktionsnamen sind aber noch wichtiger!"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d77d67a3-6161-46bf-bb3f-754391b729c8",
   "metadata": {},
   "source": [
    "## Variablen\n",
    "\n",
    "In Funktionen habt ihr schon Variablen verwendet.\n",
    "Diese lassen sich aber auch direkt zuweisen:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "4055653c-cbec-464b-aeac-a8d140fdb815",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "35"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a = 7\n",
    "b = 5\n",
    "c = a * b\n",
    "# welchen Wert hat c?\n",
    "c"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "f07ba1f6-9a39-43e4-813e-c3901b1ae350",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "35"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b = 8\n",
    "# welchen Wert hat c jetzt?\n",
    "c"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "ce519d1a-05d9-4307-a2c0-b6dad33d6053",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "56"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# c ist immer noch 35 weil es noch nicht neu berechnet wurde\n",
    "c = a * b\n",
    "# jetzt sollte es 56 sein\n",
    "c"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e9505ef6-2904-475b-837b-bba119c16b7a",
   "metadata": {},
   "source": [
    "ℹ️ Warum muss `c` eingegeben werden um das Ergebnis zu sehen?\n",
    "\n",
    "Ein Ergebnis wird nur angezeigt, wenn der Aufruf irgendetwas zurück gibt:\n",
    "        \n",
    "* Berechnung wie 1 + 2 -> Ergebnis\n",
    "* Funktionaufruf ->  das return-te\n",
    "* Zuweisung a = b -> nix\n",
    "* Variablenname -> Wert der Variable"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "65aea755-4369-4985-8dfd-c239a015dd03",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3 (ipykernel)",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.9.7"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}