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+{
+ "metadata": {
+  "name": "Chapter IV"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4: Variables, data types, and arithmetic expressions"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 4.1, Page number: 26"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#4.1.py\n",
+      "#Using the Basic Data Types\n",
+      "\n",
+      "#Variable Declarations\n",
+      "integerVar=100\n",
+      "floatingVar=331.79\n",
+      "doubleVar=8.44e+11\n",
+      "charVar='w'\n",
+      "boolVar=bool(0)\n",
+      "\n",
+      "#Result\n",
+      "print(\"integerVar={0}\".format(integerVar))\n",
+      "print(\"floatingVar={0}\".format(floatingVar))\n",
+      "print(\"doubleVar={0}\".format(doubleVar))\n",
+      "print(\"charVar={0}\".format(charVar))\n",
+      "print(\"boolVar={0}\".format(boolVar))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "integerVar=100\n",
+        "floatingVar=331.79\n",
+        "doubleVar=8.44e+11\n",
+        "charVar=w\n",
+        "boolVar=False\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 4.2, Page number: 30"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#4.2.py\n",
+      "#Using the Arithmetic Operators\n",
+      "\n",
+      "#Variable declarations\n",
+      "a=100\n",
+      "b=2\n",
+      "c=25\n",
+      "d=4\n",
+      "\n",
+      "#Calculations/Results\n",
+      "result=a-b                              #subtraction\n",
+      "print(\"a-b={0}\".format(result))         #result\n",
+      "\n",
+      "result=b*c                              #multiplication\n",
+      "print(\"b*c={0}\".format(result))         #result\n",
+      "\n",
+      "result=a/c                              #division\n",
+      "print(\"a/c={0}\".format(result))         #result\n",
+      "\n",
+      "result=a+b*c                            #precedence\n",
+      "print(\"a+b*c={0}\".format(result))       #result \n",
+      "\n",
+      "print(\"a*b+c*d={0}\".format(a*b+c*d))    #direct calculation"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "a-b=98\n",
+        "b*c=50\n",
+        "a/c=4\n",
+        "a+b*c=150\n",
+        "a*b+c*d=300\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 4.3, Page number: 33"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#4.3.py\n",
+      "#More Examples with Arithmetic Operations\n",
+      "\n",
+      "#Variable Declarations\n",
+      "a=25\n",
+      "b=2\n",
+      "c=25.0\n",
+      "d=2.0\n",
+      "\n",
+      "#Calculations/Result\n",
+      "print(\"6 + a / 5 * b = {0}\".format(6+a/5*b))\n",
+      "print(\"a / b * b = {0}\".format(a/b*b))\n",
+      "print(\"c / d * d = {0}\".format(c/d*d))\n",
+      "print(\"-a={0}\".format(-a))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "6 + a / 5 * b = 16\n",
+        "a / b * b = 24\n",
+        "c / d * d = 25.0\n",
+        "-a=-25\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 4.4, Page number: 35"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#4.4.py\n",
+      "#Illustrating the Modulus Operator\n",
+      "\n",
+      "#Variable Declarations\n",
+      "a=25\n",
+      "b=5\n",
+      "c=10\n",
+      "d=7\n",
+      "\n",
+      "#Calculations/Result\n",
+      "print(\"a % b = {0}\".format(a%b))\n",
+      "print(\"a % c = {0}\".format(a%c))\n",
+      "print(\"a % d = {0}\".format(a%d))\n",
+      "print(\"a / d * d + a % d = {0}\".format(a/d*d+a%d))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "a % b = 0\n",
+        "a % c = 5\n",
+        "a % d = 4\n",
+        "a / d * d + a % d = 25\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Program 4.5, Page number: 36"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#4.5.py\n",
+      "#Converting Between Integers and Floats\n",
+      "\n",
+      "#Variable Declarations\n",
+      "f1=123.125\n",
+      "f2=1.0\n",
+      "i1=1\n",
+      "i2=-150\n",
+      "c='a'\n",
+      "\n",
+      "\n",
+      "i1=f1                                                              #floating to integer conversion\n",
+      "print(\"{0} assigned to an int produces {1:.0f}\".format(f1,i1))\n",
+      "\n",
+      "f1=i2                                                              #integer to floating conversion\n",
+      "print(\"{0} assigned to a float produces {1}\".format(i2,f1))\n",
+      "\n",
+      "f1=i2/100                                                          #integer divided by integer\n",
+      "print(\"{0} divided by 100 produces {1}\".format(i2,f1))\n",
+      "\n",
+      "f2=i2/100.0                                                        #integer divided by a float\n",
+      "print(\"{0} divided by 100.0 produces {1}\".format(i2,f2))\n",
+      "\n",
+      "f2=float(i2/100)                                                   #type cast operator\n",
+      "print(\"{0} divided by 100 produces {1}\".format(i2,f2))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "123.125 assigned to an int produces 123\n",
+        "-150 assigned to a float produces -150\n",
+        "-150 divided by 100 produces -2\n",
+        "-150 divided by 100.0 produces -1.5\n",
+        "-150 divided by 100 produces -2.0\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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