{
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   "cell_type": "markdown",
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   "source": [
    "# January 21, 2016 In-class activities\n",
    "\n",
    "## Problem 1\n",
    "\n",
    "Write a function countdown() that takes a number and prints:\n",
    "\n",
    "```\n",
    "N\n",
    "N-1\n",
    "N-2\n",
    "...\n",
    "1\n",
    "Liftoff!\n",
    "```\n",
    "\n",
    "where N is the number you give it.\n",
    "\n",
    "Example:\n",
    "\n",
    "```\n",
    "countdown(3);\n",
    "3\n",
    "2\n",
    "1\n",
    "Liftoff!\n",
    "```\n",
    "\n",
    "One possible answer:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "|  Added method countdown(int)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "void countdown(int n) {\n",
    "    for (int i = n; i > 0; i--) {\n",
    "        printf(\"%s\\n\", i);\n",
    "    }\n",
    "    printf(\"Liftoff!\");\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "9\n",
      "8\n",
      "7\n",
      "6\n",
      "5\n",
      "4\n",
      "3\n",
      "2\n",
      "1\n",
      "Liftoff!\n"
     ]
    }
   ],
   "source": [
    "countdown(10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n",
      "2\n",
      "1\n",
      "Liftoff!\n"
     ]
    }
   ],
   "source": [
    "countdown(3)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Problem 2\n",
    "\n",
    "Write a function `volume()` that takes an height, width, and length dimensions and returns the volume of a cube with those dimensions.\n",
    "\n",
    "One possible answer:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "|  Added method volume(double,double,double)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "double volume(double width, double height, double length) {\n",
    "    return (width * height * length);\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "|  Expression value is: 72.0\n",
      "|    assigned to temporary variable $5 of type double\n",
      "\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "72.0"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "volume(3, 4, 6)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Problem 3\n",
    "\n",
    "Define a class to hold students. The constructor should take a name and a year of graduation. Add a method \"status\" that when called, says: \"You are a junior\" (or whatever). Assume that the year is 2016.\n",
    "\n",
    "``\n",
    "Student student1 = new Student(\"Milley Cyrus\", 2018);\n",
    "Student student2 = new Student(\"Taylor Swift\", 2012);\n",
    "``\n",
    "\n",
    "The status is one of:\n",
    "\n",
    "* not in college yet\n",
    "* firstyear\n",
    "* sophomore\n",
    "* junior\n",
    "* senior\n",
    "* graduated\n",
    "\n",
    "The beginning of a solution:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "|  Added class Student\n",
      "\n"
     ]
    }
   ],
   "source": [
    "class Student {\n",
    "    String name;\n",
    "    int year;\n",
    "    Student(String name, int year) {\n",
    "        this.name = name;\n",
    "        this.year = year;\n",
    "    }\n",
    "    void status() {\n",
    "        printf(\"You are crazy!\");\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "|  Added variable miley of type Student with initial value Student@50675690\n",
      "\n"
     ]
    }
   ],
   "source": [
    "Student miley = new Student(\"Miley Cyrus\", 2015);"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "You are crazy!\n"
     ]
    }
   ],
   "source": [
    "miley.status()"
   ]
  }
 ],
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