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diff --git a/Fundamental_of_Computing_and_Programming_in_C/Chapter12.ipynb b/Fundamental_of_Computing_and_Programming_in_C/Chapter12.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:13c473411b35212c9727620c7673dc52636d4bf1a83b0d4eeb082d160a75324d"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 : Union"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 1, Page No.5.87"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#program using union.\n",
+      "\n",
+      "class union_name:\n",
+      "    a=0\n",
+      "    b=[0,1]\n",
+      "    \n",
+      "c=union_name()\n",
+      "c.a=256\n",
+      "\n",
+      "print \"c.a value is %d\\n \"%c.a\n",
+      "print \"c.b[0] value is %d\\n\"%c.b[0]\n",
+      "print \"c.b[1] value is %d\\n\"%c.b[1]\n",
+      "\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "c.a value is 256\n",
+        " \n",
+        "c.b[0] value is 0\n",
+        "\n",
+        "c.b[1] value is 1\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 2, Page No.:5.87"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#program to find size of union and number of bytes\n",
+      "\n",
+      "import sys\n",
+      "\n",
+      "class union_result:\n",
+      "    marks=0\n",
+      "    grade=''\n",
+      "    \n",
+      "    \n",
+      "class struct_res:\n",
+      "    name=[15]\n",
+      "    age=0\n",
+      "    sex=''\n",
+      "    address=''\n",
+      "    pincode=0\n",
+      "    perf=union_result()\n",
+      "    \n",
+      "data=struct_res()   \n",
+      "\n",
+      "#Result\n",
+      "print \"Size of Union: %d\\n\"%sys.getsizeof(data.perf)\n",
+      "print \"Size of Structure: %d\\n\"%sys.getsizeof(data)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Size of Union: 32\n",
+        "\n",
+        "Size of Structure: 32\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Pointer to Unions cannot convert as no pointer in python. Page no. 5.88"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 3, Page No.:5.89"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program that includes of initial values to structure variable\n",
+      "\n",
+      "import sys\n",
+      "\n",
+      "\n",
+      "class union_id:\n",
+      "    color='20'\n",
+      "    size=0\n",
+      "    \n",
+      "\n",
+      "class struct_clothes:\n",
+      "    manufacturer='30'\n",
+      "    cost=0.0\n",
+      "    description=union_id()\n",
+      "    \n",
+      "    \n",
+      "shirt=struct_clothes()\n",
+      "shirt.manufacturer='Indian'\n",
+      "shirt.cost=35.00\n",
+      "shirt.description.color='Black'\n",
+      "\n",
+      "print \"%d\\n\"%(sys.getsizeof(union_id))\n",
+      "\n",
+      "print \"%s %f \"%(shirt.manufacturer,shirt.cost),\"%s %d\\n \"%(shirt.description.color, shirt.description.size)\n",
+      " \n",
+      "\n",
+      "shirt.description.size =12\n",
+      "\n",
+      "\n",
+      "print \"%s %f \"%(shirt.manufacturer, shirt.cost),\"%s %d\\n \"%(shirt.description.color, shirt.description.size)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "48\n",
+        "\n",
+        "Indian 35.000000  Black 0\n",
+        " \n",
+        "Indian 35.000000  Black 12\n",
+        " \n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 4, Page no.: 5.92"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to read and write employee and their date of joining using nested structure. \n",
+      "\n",
+      "\n",
+      "class date:\n",
+      "    day=0\n",
+      "    month=\"\"\n",
+      "    year=0\n",
+      "    \n",
+      "class employee:\n",
+      "    code=0\n",
+      "    name=''\n",
+      "    salary=0.0\n",
+      "    doj=date()\n",
+      "    \n",
+      "    \n",
+      "emp1=employee()\n",
+      "\n",
+      "emp1.code=input(\"Enter Employee Code: \")\n",
+      "emp1.name=raw_input(\"Enter the Employee Name: \")\n",
+      "emp1.salary=input(\"Enter the Employee Salary: \")\n",
+      "\n",
+      "print \"\\nEnter Date of joining in order\\n\"\n",
+      "emp1.doj.day=input(\"Enter day: \")\n",
+      "emp1.doj.month=raw_input(\"Enter month: \")\n",
+      "emp1.doj.year=input(\"Enter year: \")\n",
+      "\n",
+      "print \"\\nThe Employee Code is: %d\"%emp1.code\n",
+      "print \"\\nThe Employee Name is: %s\"%emp1.name\n",
+      "print \"\\nThe Employee Name is: %f\"%emp1.salary\n",
+      "print \"\\nThe Employee DOJ is: %d %s %d\"%(emp1.doj.day,emp1.doj.month,emp1.doj.year)\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter Employee Code: 200\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Employee Name: VIJI\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Employee Salary: 2000.00\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Enter Date of joining in order\n",
+        "\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter day: 12\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter month: December\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter year: 2004\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "The Employee Code is: 200\n",
+        "\n",
+        "The Employee Name is: VIJI\n",
+        "\n",
+        "The Employee Name is: 2000.000000\n",
+        "\n",
+        "The Employee DOJ is: 12 December 2004\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 5, Page No. 5.93"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to store 3 records in one structure\n",
+      "\n",
+      "\n",
+      "class book:\n",
+      "    name=''\n",
+      "    price=0\n",
+      "    pages=0\n",
+      "    \n",
+      "    \n",
+      "b=[book() for a in range(0,3)]\n",
+      "\n",
+      "for i in range(0,3):\n",
+      "    b[i].name=raw_input(\"Enter the Book Name: \")\n",
+      "    b[i].price=input(\"Enter the Book Price: \")\n",
+      "    b[i].pages=input(\"Enter the Book Pages: \")\n",
+      "    \n",
+      "print '\\n'    \n",
+      "for i in range(0,3):\n",
+      "    print \"%s\\t\"%(b[i].name),\"%d\\t\"%(b[i].price),\"%d\\n\"%(b[i].pages)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Name: English\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Price: 165\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Pages: 200\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Name: Maths\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Price: 300\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Pages: 450\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Name: Physics\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Price: 250\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Book Pages: 370\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "\n",
+        "English\t165\t200\n",
+        "\n",
+        "Maths\t300\t450\n",
+        "\n",
+        "Physics\t250\t370\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 6, Page No. 5.95"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to copy of entire structure to a function\n",
+      "\n",
+      "class std:\n",
+      "    no=0\n",
+      "    avg=0.0\n",
+      "\n",
+      "a=std()\n",
+      "\n",
+      "a.no=15\n",
+      "a.avg=90.75\n",
+      "\n",
+      "def func(Struct_p):\n",
+      "    print \"Number is.... %d\\n\"%a.no\n",
+      "    print \"Average is... %f\"%a.avg\n",
+      "    \n",
+      "func(a)\n",
+      "\n",
+      "    "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number is.... 15\n",
+        "\n",
+        "Average is... 90.750000\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 7, Page No.:5.97"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "#Programs shows how the structure can be accessed by a pointer variable.\n",
+      "\n",
+      "class student:\n",
+      "    roll_no=0\n",
+      "    name=''\n",
+      "    marks=0.0\n",
+      "stud1=student()\n",
+      "\n",
+      "print \"Enter the student details: \\n\"\n",
+      "stud1.roll_no=input()\n",
+      "stud1.name=raw_input()\n",
+      "stud1.marks=input()\n",
+      "\n",
+      "print \"\\nDisplay of structure using structure variable\\n\"\n",
+      "print \"Roll No\\t Name\\t Marks\"\n",
+      "print \"\\n-------\\t ----- -------\\n\"\n",
+      "print \"%d\\t %s\\t %f\"%(stud1.roll_no,stud1.name,stud1.marks)\n",
+      "\n",
+      "pt=stud1\n",
+      "\n",
+      "print \"\\nDisplay of structure using pointer variable\\n\"\n",
+      "print \"Roll No\\t Name\\t Marks\"\n",
+      "print \"\\n-------\\t ----- -------\\n\"\n",
+      "print \"%d\\t %s\\t %f\"%(pt.roll_no,pt.name,pt.marks)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the student details: \n",
+        "\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "39\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Muni\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "77\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Display of structure using structure variable\n",
+        "\n",
+        "Roll No\t Name\t Marks\n",
+        "\n",
+        "-------\t ----- -------\n",
+        "\n",
+        "39\t Muni\t 77.000000\n",
+        "\n",
+        "Display of structure using pointer variable\n",
+        "\n",
+        "Roll No\t Name\t Marks\n",
+        "\n",
+        "-------\t ----- -------\n",
+        "\n",
+        "39\t Muni\t 77.000000\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Case Study: 1, Page No.:5.98"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to transfer a structure to a function by passing the structure address to the function\n",
+      "\n",
+      "class struct:\n",
+      "    name=''\n",
+      "    no=0\n",
+      "    age=0\n",
+      "record=struct()\n",
+      "std=record\n",
+      "std.name,std.no,std.age=[\"LAK\",15,25]\n",
+      "print \"%s\\t%d\\t%d\"%(std.name,std.no,std.age)\n",
+      "\n",
+      "def fun(std):\n",
+      "    pt.name=\"Muni\"\n",
+      "    pt.no=16\n",
+      "    pt.age=26\n",
+      "    \n",
+      "std.name=pt.name\n",
+      "std.no=pt.no\n",
+      "std.age=pt.age\n",
+      "\n",
+      "print \"%s\\t%d\\t%d\"%(std.name,std.no,std.age)\n",
+      "    \n",
+      "    "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "LAK\t15\t25\n",
+        "Muni\t16\t26\n"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Case Study: 2, Page No.:5.100"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to pass an array of structure to a function, and return a pointer to a structure.\n",
+      "import sys\n",
+      "N=3\n",
+      "NULL=0\n",
+      "\n",
+      "class struct:\n",
+      "    sno=0\n",
+      "    name=''\n",
+      "    age=0\n",
+      "    \n",
+      "record=struct()\n",
+      "std=record\n",
+      "\n",
+      "print \"Student Number Locater\"\n",
+      "print \"To Exit the program enter '0' for student number\"\n",
+      "stdno=input(\"Enter the Student Number: \")\n",
+      "print \"\\n\"\n",
+      "if stdno ==15:\n",
+      "\n",
+      "    std.sno,std.name,std.age=[15,\"MUNI\",28]\n",
+      "    print \"Number .... %d \\n\"%(std.sno)\n",
+      "    print \"Name ...... %s\\n\"%(std.name)\n",
+      "    print \"Age ....... %d\\n\"%(std.age)\n",
+      "if stdno == 16:\n",
+      "    std.sno,std.name,std.age=[16,\"LAK\",27]\n",
+      "    print \"Number .... %d \\n\"%(std.sno)\n",
+      "    print \"Name ...... %s\\n\"%(std.name)\n",
+      "    print \"Age ....... %d\\n\"%(std.age)\n",
+      "    \n",
+      "if stdno == 17:\n",
+      "    std.sno,std.name,std.age=[17,\"RAJA\",31]\n",
+      "    print \"Number .... %d \\n\"%(std.sno)\n",
+      "    print \"Name ...... %s\\n\"%(std.name)\n",
+      "    print \"Age ....... %d\\n\"%(std.age)\n",
+      "    \n",
+      "if stdno==0:\n",
+      "    exit\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Student Number Locater\n",
+        "To Exit the program enter '0' for student number\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter the Student Number: 15\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "\n",
+        "Number .... 15 \n",
+        "\n",
+        "Name ...... MUNI\n",
+        "\n",
+        "Age ....... 28\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Case Study: 3, Page No.: 5.101"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to print student name and mark using structure\n",
+      "\n",
+      "class student:\n",
+      "    name=''\n",
+      "    marks=0.00\n",
+      "    \n",
+      "s1=''\n",
+      "f=0.00\n",
+      "\n",
+      "student1=student()\n",
+      "\n",
+      "student2=student()\n",
+      "\n",
+      "\n",
+      "student1.name=raw_input(\"Enter Name: \")\n",
+      "f=input(\"Enter Mark: \")\n",
+      "\n",
+      "student2.marks=f\n",
+      "\n",
+      "print \"\\nName is %s \\n\"%student1.name\n",
+      "print \"Marks are %f \\n\"%student2.marks\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter Name: Venkat\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter Mark: 89\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Name is Venkat \n",
+        "\n",
+        "Marks are 89.000000 \n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Case Study 4, Page No.: 5.102"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to print marks, grade and their address using union\n",
+      "\n",
+      "\n",
+      "\n",
+      "class union_marks:\n",
+      "    perc=0.00\n",
+      "    grade=''\n",
+      "    \n",
+      "student1=union_marks()\n",
+      "\n",
+      "student1.perc=98.5\n",
+      "\n",
+      "print \"Marks are %f \\t address is %8lu\\n\"%(student1.perc, id(student1.perc))\n",
+      "\n",
+      "student1.grade='A'\n",
+      "\n",
+      "print \"Grade is %c \\t address is %8lu\\n\"%(student1.grade,id(student1.grade))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Marks are 98.500000 \t address is 158368916\n",
+        "\n",
+        "Grade is A \t address is 3073485064\n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file