removing unwanted files

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diff --git a/_Programming_With_C/chapter12.ipynb b/_Programming_With_C/chapter12.ipynb
deleted file mode 100644
index 09e4c7e9..00000000
--- a/_Programming_With_C/chapter12.ipynb
+++ /dev/null
@@ -1,565 +0,0 @@
-{

- "metadata": {

-  "name": ""

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h1>Chapter 12: Structures and Unions<h1>"

-     ]

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.1, Page 12.2<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*20\n",

-      "\n",

-      "class account(Structure):\n",

-      "\t_fields_=[('acct_no',c_int),('acct_type',c_char),('name',string),('balance',c_int)]\n",

-      "\n",

-      "customer=account(12632,'r','Joseph',1200)\n",

-      "\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [],

-     "prompt_number": 1

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.4, Page 12.4<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*20\n",

-      "\n",

-      "class date(Structure):\n",

-      "\t_fields_=[('month',c_int),('day',c_int),('year',c_int)]\n",

-      "\t\n",

-      "class account(Structure):\n",

-      "\t_fields_=[('acct_no',c_int),('acct_type',c_char),('name',string),('balance',c_float),('lastpayment',date)]\n",

-      "\t\n",

-      "customer=account(12345,'r','John W. Smith',586.30,date(5,24,90))"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [],

-     "prompt_number": 2

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.6, Page 12.6<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*20\n",

-      "\n",

-      "class date(Structure):\n",

-      "\t\n",

-      "\t_fields_=[('name',string),('month',c_int),('day',c_int),('year',c_int)]\n",

-      "\n",

-      "birthday=[]\n",

-      "birthday.append(date('Amy',12,30,73))\n",

-      "birthday.append(date('Gail',5,13,66))\n",

-      "birthday.append(date('Marc',7,15,72))\n",

-      "birthday.append(date('Marla',11,29,70))\n",

-      "birthday.append(date('Megan',2,4,77))\n",

-      "birthday.append(date('Sharon',12,29,63))\n",

-      "birthday.append(date('Susan',4,12,69))"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [],

-     "prompt_number": 3

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.14, Page 12.13<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*50\n",

-      "\n",

-      "def writeoutput(obj):\n",

-      "\tprint \"Name : \",obj.name,\n",

-      "\tprint \"\\t Account Number : \",obj.acct_no\n",

-      "\tprint \"Street : \",obj.street\n",

-      "\tprint \"City : \",obj.city\n",

-      "\tprint \"Old Balance : %7.2f\" %(obj.oldbalance)\n",

-      "\tprint \"Payment : %7.2f\" %(obj.payment)\n",

-      "\tprint \"New Balance : %7.2f\" %(obj.newbalance)\n",

-      "\tprint \"Account Status : \",\n",

-      "\t\n",

-      "\tif obj.acct_type=='C':\n",

-      "\t\tprint \"CURRENT\\n\\n\"\n",

-      "\telif obj.acct_type=='O':\n",

-      "\t\tprint \"OVERDUE\\n\\n\"\n",

-      "\telse:\n",

-      "\t\tprint \"DELINQUENT\\n\\n\"\n",

-      "\t\t\n",

-      "\treturn\n",

-      "\n",

-      "\n",

-      "class date(Structure):\n",

-      "\t_fields_=[('month',c_int),('day',c_int),('year',c_int)]\n",

-      "\t\n",

-      "\n",

-      "class account(Structure):\n",

-      "\t_fields_=[('name',string),('street',string),('city',string),('acct_no',c_int),('oldbalance',c_float),('payment',c_float),('lastpayment',date),('newbalance',c_float),('acct_type',c_char)]\n",

-      "\t\t\n",

-      "print \"CUSOMER BILLING SYSTEM\\n\\n\"\n",

-      "customer=[]\n",

-      "name='Steve Johnson'\n",

-      "street='123 Mountainview Drive '\n",

-      "city='Denver . CO'\n",

-      "acct_no=4208\n",

-      "oldbalance=247.88\n",

-      "payment=25.00\n",

-      "lastpay=date(6,14,1998)\n",

-      "customer.append(account(name,street,city,acct_no,oldbalance,payment,lastpay))\n",

-      "\n",

-      "name='Susan Richards'\n",

-      "street='4383 Aligator Blvd'\n",

-      "city='Fort Lauderdale. FL'\n",

-      "acct_no=2219\n",

-      "oldbalance=135.00\n",

-      "payment=135.00\n",

-      "lastpay=date(8,10,2000)\n",

-      "customer.append(account(name,street,city,acct_no,oldbalance,payment,lastpay))\n",

-      "\n",

-      "name='Martin Peterson'\n",

-      "street='1787 Pacific Parkway'\n",

-      "city='San Diego. CA'\n",

-      "acct_no=8452\n",

-      "oldbalance=387.42\n",

-      "payment=35.00\n",

-      "lastpay=date(9,22,1999)\n",

-      "customer.append(account(name,street,city,acct_no,oldbalance,payment,lastpay))\n",

-      "\n",

-      "name='Phyllis Smith'\n",

-      "street='1000 Great White Way'\n",

-      "city='New York. NY'\n",

-      "acct_no=711\n",

-      "oldbalance=260.00\n",

-      "payment=0.00\n",

-      "lastpay=date(11,27,2001)\n",

-      "customer.append(account(name,street,city,acct_no,oldbalance,payment,lastpay))\n",

-      "\n",

-      "\n",

-      "\n",

-      "for i in range(0,4):\n",

-      "\tif customer[i].payment>0:\n",

-      "\t\tif customer[i].payment<0.1*customer[i].oldbalance:\n",

-      "\t\t\tcustomer[i].acct_type='O'\n",

-      "\t\telse:\n",

-      "\t\t\tcustomer[i].acct_type='C'\n",

-      "\telse:\n",

-      "\t\tif customer[i].oldbalance>0:\n",

-      "\t\t\tcustomer[i].acct_type='D'\n",

-      "\t\telse:\n",

-      "\t\t\tcustomer[i].acct_type='C'\n",

-      "\t\n",

-      "\tcustomer[i].newbalance=customer[i].oldbalance-customer[i].payment\n",

-      "\t\n",

-      "\twriteoutput(customer[i])\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "CUSOMER BILLING SYSTEM\n",

-        "\n",

-        "\n",

-        "Name :  Steve Johnson \t Account Number :  4208\n",

-        "Street :  123 Mountainview Drive \n",

-        "City :  Denver . CO\n",

-        "Old Balance :  247.88\n",

-        "Payment :   25.00\n",

-        "New Balance :  222.88\n",

-        "Account Status :  CURRENT\n",

-        "\n",

-        "\n",

-        "Name :  Susan Richards \t Account Number :  2219\n",

-        "Street :  4383 Aligator Blvd\n",

-        "City :  Fort Lauderdale. FL\n",

-        "Old Balance :  135.00\n",

-        "Payment :  135.00\n",

-        "New Balance :    0.00\n",

-        "Account Status :  CURRENT\n",

-        "\n",

-        "\n",

-        "Name :  Martin Peterson \t Account Number :  8452\n",

-        "Street :  1787 Pacific Parkway\n",

-        "City :  San Diego. CA\n",

-        "Old Balance :  387.42\n",

-        "Payment :   35.00\n",

-        "New Balance :  352.42\n",

-        "Account Status :  OVERDUE\n",

-        "\n",

-        "\n",

-        "Name :  Phyllis Smith \t Account Number :  711\n",

-        "Street :  1000 Great White Way\n",

-        "City :  New York. NY\n",

-        "Old Balance :  260.00\n",

-        "Payment :    0.00\n",

-        "New Balance :  260.00\n",

-        "Account Status :  DELINQUENT\n",

-        "\n",

-        "\n"

-       ]

-      }

-     ],

-     "prompt_number": 4

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.25, Page 12.29<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*10\n",

-      "\n",

-      "class record(Structure):\n",

-      "\t_fields_=[('name',string),('acct_no',c_int),('acct_type',c_char),('balance',c_float)]\n",

-      "\t\n",

-      "def adjust(obj):\n",

-      "\tobj.name='Jones'\n",

-      "\tobj.acct_no=9999\n",

-      "\tobj.acct_type='R'\n",

-      "\tobj.balance=99.99\n",

-      "\treturn\n",

-      "\n",

-      "\n",

-      "customer=record('Smith',3333,'C',33.33)\n",

-      "print customer.name,customer.acct_no,customer.acct_type,\n",

-      "print \"%.2f\" %customer.balance\n",

-      "\n",

-      "adjust(customer)\n",

-      "\n",

-      "print customer.name,customer.acct_no,customer.acct_type,\n",

-      "print \"%.2f\" %customer.balance\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Smith 3333 C 33.33\n",

-        "Jones 9999 R 99.99\n"

-       ]

-      }

-     ],

-     "prompt_number": 5

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.32, Page 12.42<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "class node():\n",

-      "\t\n",

-      "\tdef __init__(self,data):\n",

-      "\t\tself.data=data\n",

-      "\t\tself.next=None\n",

-      "\n",

-      "\t\t\n",

-      "class list():\n",

-      "\t\n",

-      "\tdef __init__(self):\n",

-      "\t\tself.head=None\n",

-      "\t\tself.tail=None\n",

-      "\t\n",

-      "\tdef insert(self,x):\n",

-      "\t\t\n",

-      "\t\te=node(x)\n",

-      "\t\t\n",

-      "\t\tif self.head==None:\n",

-      "\t\t\tself.head=e\n",

-      "\t\t\tself.tail=e\n",

-      "\t\t\t\n",

-      "\t\telse:\n",

-      "\t\t\tself.tail.next=e\n",

-      "\t\t\tself.tail=e\n",

-      "\t\t\t\n",

-      "def display(ptr):\n",

-      "\tnptr=ptr.head\n",

-      "\twhile nptr!=None:\n",

-      "\t\tprint nptr.data\n",

-      "\t\tnptr=nptr.next\n",

-      "\t\n",

-      "\treturn\n",

-      "\t\n",

-      "def delete(ptr,element):\n",

-      "\tnptr=ptr.head\n",

-      "\twhile nptr.next.data!=element:\n",

-      "\t\tnptr=nptr.next\n",

-      "\t\tif nptr.next==None:\n",

-      "\t\t\treturn\n",

-      "\t\n",

-      "\tdptr=nptr.next\n",

-      "\tnptr.next=dptr.next\n",

-      "\tdel dptr\n",

-      "\treturn\n",

-      "\t\n",

-      "p=list()\n",

-      "p.insert('BOSTON')\n",

-      "p.insert('CHICAGO')\n",

-      "p.insert('DENVER')\n",

-      "p.insert('NEW YORK')\n",

-      "p.insert('PITTSBURG')\n",

-      "\n",

-      "display(p)\n",

-      "print '\\n\\nAFTER DELETING DENVER\\n\\n'\n",

-      "delete(p,'DENVER')\n",

-      "display(p)\n",

-      "\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "BOSTON\n",

-        "CHICAGO\n",

-        "DENVER\n",

-        "NEW YORK\n",

-        "PITTSBURG\n",

-        "\n",

-        "\n",

-        "AFTER DELETING DENVER\n",

-        "\n",

-        "\n",

-        "BOSTON\n",

-        "CHICAGO\n",

-        "NEW YORK\n",

-        "PITTSBURG\n"

-       ]

-      }

-     ],

-     "prompt_number": 8

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.35, Page 12.57<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "from ctypes import *\n",

-      "\n",

-      "string=c_char*20\n",

-      "\n",

-      "class id(Union):\n",

-      "\t_fields_=[('color',c_char),('size',c_int)]\n",

-      "\t\n",

-      "class clothes(Structure):\n",

-      "\t_fields_=[('manufacturer',string),('cost',c_float),('description',id)]\n",

-      "\t\n",

-      "shirt=clothes()\n",

-      "shirt.description.color='w'\n",

-      "print \"%c %d\\n\" %(shirt.description.color,shirt.description.size)\n",

-      "\n",

-      "shirt.description.size=12\n",

-      "print \"%c %d\" %(shirt.description.color,shirt.description.size)\n",

-      "\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "w 119\n",

-        "\n",

-        "\f",

-        " 12\n"

-       ]

-      }

-     ],

-     "prompt_number": 7

-    },

-    {

-     "cell_type": "markdown",

-     "metadata": {},

-     "source": [

-      "<h3>Example 12.37, Page 12.59<h3>"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "\n",

-      "from ctypes import *\n",

-      "import math\n",

-      "\n",

-      "\n",

-      "class nvals(Union):\n",

-      "\t_fields_=[('fexp',c_float),('nexp',c_int)]\n",

-      "\t\n",

-      "class values(Structure):\n",

-      "\t_fields_=[('x',c_float),('flag',c_char),('exp',nvals)]\n",

-      "\t\n",

-      "def power(a):\n",

-      "\ty=a.x\n",

-      "\t\n",

-      "\tif a.flag=='i':\n",

-      "\t\tif a.exp.nexp==0:\n",

-      "\t\t\ty=1.0\n",

-      "\t\telse:\n",

-      "\t\t\ti=1\n",

-      "\t\t\twhile i<abs(a.exp.nexp):\n",

-      "\t\t\t\ty*=a.x\n",

-      "\t\t\t\ti+=1\n",

-      "\t\t\t\n",

-      "\t\t\tif a.exp.nexp<0:\n",

-      "\t\t\t\ty=1.0/y\n",

-      "\t\n",

-      "\telse:\n",

-      "\t\ty=math.exp(a.exp.fexp*math.log(a.x))\n",

-      "\t\n",

-      "\treturn y\n",

-      "\t\n",

-      "def main(in1,n):\n",

-      "\ta=values()\n",

-      "\ta.x=in1\n",

-      "\t\n",

-      "\ti=int(n)\n",

-      "\t\n",

-      "\tif i==n:\n",

-      "\t\ta.flag='i'\n",

-      "\telse:\n",

-      "\t\ta.flag='f'\n",

-      "\t\n",

-      "\tif a.flag=='i':\n",

-      "\t\ta.exp.nexp=i\n",

-      "\telse:\n",

-      "\t\ta.exp.fexp=n\n",

-      "\t\t\n",

-      "\tif a.flag=='f' and a.x<=0.0:\n",

-      "\t\tprint \"ERROR - Cannot raise a non-positive number to a floating point power\"\n",

-      "\telse:\n",

-      "\t\ty=power(a)\n",

-      "\t\tprint \"y=%.4f\" %y\n",

-      "\t\n",

-      "\treturn\n",

-      "\n",

-      "print \"\\nx=2\\nn=3\"\n",

-      "main(2,3)\n",

-      "print \"\\nx=-2\\nn=3\"\n",

-      "main(-2,3)\n",

-      "print \"\\nx=2.2\\nn=3.3\"\n",

-      "main(2.2,3.3)\n",

-      "print \"\\nx=-2.2\\nn=3.3\"\n",

-      "main(-2.2,3.3)\n",

-      "\n",

-      "\n",

-      "\t\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "\n",

-        "x=2\n",

-        "n=3\n",

-        "y=8.0000\n",

-        "\n",

-        "x=-2\n",

-        "n=3\n",

-        "y=-8.0000\n",

-        "\n",

-        "x=2.2\n",

-        "n=3.3\n",

-        "y=13.4895\n",

-        "\n",

-        "x=-2.2\n",

-        "n=3.3\n",

-        "ERROR - Cannot raise a non-positive number to a floating point power\n"

-       ]

-      }

-     ],

-     "prompt_number": 6

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [],

-     "language": "python",

-     "metadata": {},

-     "outputs": []

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
\ No newline at end of file