{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Variables"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. Must start with a letter, can have a combination of letters/numbers\n",
    "2. Case sensitive\n",
    "3. The format can be changed:"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**format** — change the number/variable format"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x =\n",
      "\n",
      "    3.1416\n"
     ]
    }
   ],
   "source": [
    "% some formats: short (default), short e, long, long e, bank\n",
    "x = pi;\n",
    "format short  % default format\n",
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x =\n",
      "\n",
      "   3.1416e+00\n"
     ]
    }
   ],
   "source": [
    "format short e % scientific notation, short\n",
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x =\n",
      "\n",
      "   3.141592653589793\n"
     ]
    }
   ],
   "source": [
    "format long    % much more precision\n",
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x =\n",
      "\n",
      "     3.141592653589793e+00\n"
     ]
    }
   ],
   "source": [
    "format long e\n",
    "x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x =\n",
      "\n",
      "          3.14\n"
     ]
    }
   ],
   "source": [
    "format bank   % two decimals, currency\n",
    "x\n",
    "format short  % back to default"
   ]
  }
 ],
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