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diff --git a/Computer_Programming_Theory_and_Practice/Chapter3.ipynb b/Computer_Programming_Theory_and_Practice/Chapter3.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:0ff7bb47f00bae9dc5a49237df7011debd17443ba836341d55e8fe830338ade7"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 3: Input/Output Functions and Statements"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1 , Page number: CP-39"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#program to add and find product of two numbers\n",
+      "\n",
+      "#variable declaration\n",
+      "a = 5\n",
+      "b = 3\n",
+      "\n",
+      "# calculation of sum and product \n",
+      "\n",
+      "summ = a + b\n",
+      "product = a * b\n",
+      "\n",
+      "print a,b\n",
+      "print summ,product"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "5 3\n",
+        "8 15\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2 , Page number: CP-45"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Program to convert degree fahrenheit to celcius \n",
+      "# variable declaration\n",
+      "\n",
+      "f = 105.00\n",
+      "print \"Degree fahrenheit ? %d\" % f\n",
+      "# calculation of degree in celcius \n",
+      "\n",
+      "c = 5.0/9.0 * (f-32)\n",
+      "\n",
+      "# result \n",
+      "print\n",
+      "print \"Degree centigrade =%6.2f\" % c"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Degree fahrenheit ? 105\n",
+        "\n",
+        "Degree centigrade = 40.56\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3 , Page number: CP-45"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# To find area of a triangle\n",
+      "# variable declaration\n",
+      "\n",
+      "a = 5\n",
+      "b = 4\n",
+      "c = 6\n",
+      "\n",
+      "\n",
+      "# calculation of area\n",
+      "s = float((a+b+c))/2\n",
+      "area = (s*(s-a)*(s-b)*(s-c)) ** 0.5\n",
+      "\n",
+      "# result\n",
+      "print \"Enter three sides : %d\" % a,b,c\n",
+      "print \n",
+      "print \"Area of triangle = %0.2f Sq.units\" % area"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter three sides : 5 4 6\n",
+        "\n",
+        "Area of triangle = 9.92 Sq.units\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4 , Page number: CP-51"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# To print ASCII value of a given character \n",
+      "# Variable declaration\n",
+      "\n",
+      "ch = \"A\"\n",
+      "print \"Enter a character : \" , ch\n",
+      "\n",
+      "# Calculation of ASCII value of a character\n",
+      "\n",
+      "print \n",
+      "print \"ASCII value of \" + ch + \" is\" ,ord(ch)\n",
+      "print \"Press any key to stop. . .\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a character :  A\n",
+        "\n",
+        "ASCII value of A is 65\n",
+        "Press any key to stop. . .\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5 , Page number: CP-51"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# To print electricity for consumers\n",
+      "# Variable declaration\n",
+      "\n",
+      "sno = \"TMR65358\"\n",
+      "pmr = 4305\n",
+      "cmr = 4410\n",
+      "\n",
+      "print \"Enter service number :\" ,sno\n",
+      "print \"Previous meter reading ?\",pmr\n",
+      "print \"Current meter reading ?\",cmr\n",
+      "\n",
+      "# Calculation of electricity charges\n",
+      "\n",
+      "units = cmr - pmr\n",
+      "amt = units * 1.50\n",
+      "\n",
+      "# Result\n",
+      "\n",
+      "print\n",
+      "print \"         Electricity Bill\"\n",
+      "print \"         ----------------\"\n",
+      "print \"Service No :\",sno\n",
+      "print \"Unit Consumed :\",units\n",
+      "print \"Electricity Charges : Rs.%0.2f\" % amt"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter service number : TMR65358\n",
+        "Previous meter reading ? 4305\n",
+        "Current meter reading ? 4410\n",
+        "\n",
+        "         Electricity Bill\n",
+        "         ----------------\n",
+        "Service No : TMR65358\n",
+        "Unit Consumed : 105\n",
+        "Electricity Charges : Rs.157.50\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6 , Page number: CP-52"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Program to swap value of two variables\n",
+      "# Variable declaration\n",
+      "\n",
+      "a = 15\n",
+      "b = 250 \n",
+      "\n",
+      "print \"Enter value to A :\",a\n",
+      "print \"Enter value to B :\",b\n",
+      "\n",
+      "# Swapping\n",
+      "\n",
+      "temp = a\n",
+      "a = b\n",
+      "b = temp\n",
+      "\n",
+      "print \n",
+      "print \"Value of A =\",a\n",
+      "print \"Value of B =\",b"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter value to A : 15\n",
+        "Enter value to B : 250\n",
+        "\n",
+        "Value of A = 250\n",
+        "Value of B = 15\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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