path: root/Let_us_C/chapter-2.ipynb

{
 "metadata": {
  "name": "chapter-2.ipynb"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h1>Chapter 2: The Decision Control Structure <h1>"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>If Demo , Page number: 52<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''Demonstration of if statement\n",
      "Here is a simple program, which demonstrates the use of if and the relational operators'''\n",
      "\n",
      "#taking in input from the user\n",
      "#num = raw_input(\"Enter a number less than 10: \")\n",
      "print \"Enter a number less than 10: \"\n",
      "num = 8\n",
      "print num\n",
      "\n",
      "#if statement\n",
      "if num <= 10:\n",
      "    print(\"What an obedient servant you are !\") #display result\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter a number less than 10: \n",
        "8\n",
        "What an obedient servant you are !\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.1 , Page number: 53<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''While purchasing certain items, a discount of 10% is offered if the quantity purchased is more than 1000.\n",
      "If quantity and price per item are input through the keyboard, write a program to calculate the total expenses.'''\n",
      "\n",
      "#Variable declaration\n",
      "dis = 0 #Initial Discount (%0)\n",
      "\n",
      "#Input from the user\n",
      "#qty,rate = raw_input(\"Enter quantity and rate: \").split()\n",
      "print \"Enter quantity and rate: \"\n",
      "qty = 1200  # Quantity of item\n",
      "rate = 15.50 # Rate of item (Rs)\n",
      "print qty , rate\n",
      "\n",
      "#discount of 10% if quantity > 1000\n",
      "if qty > 1000:\n",
      "    dis = 10\n",
      "\n",
      "#Calculation\n",
      "tot = (qty * rate) - (qty * rate * dis / 100 )  # total expenses (Rs)\n",
      "\n",
      "#Result\n",
      "print \"Total expenses = Rs. \", tot \n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter quantity and rate: \n",
        "1200 15.5\n",
        "Total expenses = Rs.  16740.0\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.2, Page number: 57<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''The current year and the year in which the employee joined the organization are entered through the keyboard.\n",
      "If the number of years for which the employee has served the organization is greater than 3 then a bonus of Rs. 2500/- is given to the employee.\n",
      "If the years of service are not greater than 3, then the program should do nothing'''\n",
      "\n",
      "#input from user\n",
      "#cy,yoj = raw_input(\"Enter current year and year of joining: \").split() \n",
      "print \"Enter current year and year of joining: \"\n",
      "cy = 2013 # Current year\n",
      "yoj = 1990 # Year of joining\n",
      "print cy, yoj \n",
      "#Calculation\n",
      "yr_of_ser = cy - yoj # number of years of service\n",
      "\n",
      "#Assign bonus if years of service > 3\n",
      "if yr_of_ser > 3:\n",
      "    bonus = 2500 # Bonus of Rs. 2500\n",
      "    print \"Bonus = Rs.\", bonus  #display result\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter current year and year of joining: \n",
        "2013 1990\n",
        "Bonus = Rs. 2500\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.3 , Page number: 58<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''In a company an employee is paid as under:\n",
      "If his basic salary is less than Rs. 1500, then HRA = 10% of basic salary and\n",
      "DA = 90% of basic salary. If his salary is either equal to or above Rs. 1500, then HRA = Rs. 500 and DA = 98% of basic salary.\n",
      "If the employee's salary is input through the keyboard ,write a program to find his gross salary.'''\n",
      "\n",
      "#input from user\n",
      "#bs = raw_input(\"Enter basic salary: \")\n",
      "print \"Enter basic salary: \"\n",
      "bs = 2561.1 #Basic salary (Rs)\n",
      "print bs\n",
      "\n",
      "#Calculation\n",
      "if bs < 1500: # if basic salary is less than Rs.1500\n",
      "    hra = bs * 10 / 100 # HRA (Rs)\n",
      "    da = bs * 90 / 100 #DA (Rs)\n",
      "else: #if basic salary is greater than or equal to Rs.1500\n",
      "    hra = 500  # HRA (Rs)\n",
      "    da = bs * 98 / 100 # DA (Rs)\n",
      "\n",
      "gs = bs + hra + da # gross salary (Rs)\n",
      "\n",
      "#Result\n",
      "print \"gross salary = Rs. \", gs \n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter basic salary: \n",
        "2561.1\n",
        "gross salary = Rs.  5570.978\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Nested If-else , Page number: 61<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''A quick demo of nested if-else'''\n",
      "\n",
      "#input from user\n",
      "#i = raw_input(\"Enter either 1 or 2: \")\n",
      "print \"Enter either 1 or 2: \"\n",
      "i = 1\n",
      "print i\n",
      "\n",
      "#nested if-else\n",
      "if i == 1 :\n",
      "    print \"You would go to heaven !\" \n",
      "else:\n",
      "    if i == 2 :\n",
      "        print \"Hell was created with you in mind\" \n",
      "    else:\n",
      "        print  \"How about mother earth !\" "
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter either 1 or 2: \n",
        "1\n",
        "You would go to heaven !\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.4 (Method 1), Page number: 64<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''The marks obtained by a student in 5 different subjects are input through the keyboard. The student gets a division as per the following rules:\n",
      "Percentage above or equal to 60 - First division\n",
      "Percentage between 50 and 59 - Second division\n",
      "Percentage between 40 and 49 - Third division\n",
      "Percentage less than 40 - Fail\n",
      "Write a program to calculate the division obtained by the student.\n",
      "Method 1'''\n",
      "\n",
      "#input from user\n",
      "#m1,m2,m3,m4,m5 = raw_input(\"Enter marks in five subjects: \").split() \n",
      "print \"Enter marks in five subjects: \"\n",
      "m1 = 88 #Marks in 1st subject\n",
      "m2 = 92 #Marks in 2nd subject\n",
      "m3 = 87 #Marks in 3rd subject\n",
      "m4 = 66 #Marks in 4th subject\n",
      "m5 = 56 #Marks in 5th subject\n",
      "print m1,m2,m3,m4,m5\n",
      "\n",
      "#Calculation\n",
      "per = ( m1 + m2 + m3 + m4 + m5 ) / 5 #Percentage\n",
      "\n",
      "#check for different cases and display appropriate result\n",
      "if per >= 60:\n",
      "    print \"First division\"\n",
      "else:\n",
      "    if per >= 50:\n",
      "        print \"Second division\"\n",
      "    else:\n",
      "        if per >= 40:\n",
      "            print \"Third division\"\n",
      "        else:\n",
      "            print \"Fail\"\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " Enter marks in five subjects: \n",
        "88 92 87 66 56\n",
        "First division\n"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.4 (Method 2), Page number: 65<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''Method 2'''\n",
      "\n",
      "#input from user\n",
      "#m1,m2,m3,m4,m5 = raw_input(\"Enter marks in five subjects: \").split() \n",
      "print \"Enter marks in five subjects: \"\n",
      "m1 = 88 #Marks in 1st subject\n",
      "m2 = 92 #Marks in 2nd subject\n",
      "m3 = 87 #Marks in 3rd subject\n",
      "m4 = 66 #Marks in 4th subject\n",
      "m5 = 56 #Marks in 5th subject\n",
      "print m1,m2,m3,m4,m5\n",
      "\n",
      "#Calculation\n",
      "per = ( m1 + m2 + m3 + m4 + m5 ) / 5 #Percentage\n",
      "\n",
      "#check for different cases and display appropriate result\n",
      "if per >= 60:\n",
      "    print \"First division\"\n",
      "\n",
      "if (per >= 50) and (per <60):\n",
      "    print\"Second division\"\n",
      "\n",
      "if (per >= 40) and (per <50):\n",
      "    print\"Third division\"\n",
      "\n",
      "if per < 40 :\n",
      "    print\"Fail\"\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter marks in five subjects: \n",
        "88 92 87 66 56\n",
        "First division\n"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.4 (Method 3), Page number: 67<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''Method 3 - else if ladder demo'''\n",
      "\n",
      "#input from user\n",
      "#m1,m2,m3,m4,m5 = raw_input(\"Enter marks in five subjects: \").split() \n",
      "print \"Enter marks in five subjects: \"\n",
      "m1 = 88 #Marks in 1st subject\n",
      "m2 = 92 #Marks in 2nd subject\n",
      "m3 = 87 #Marks in 3rd subject\n",
      "m4 = 66 #Marks in 4th subject\n",
      "m5 = 56 #Marks in 5th subject\n",
      "print m1,m2,m3,m4,m5\n",
      "\n",
      "#Calculation\n",
      "per = ( m1 + m2 + m3 + m4 + m5 ) / 5 #Percentage\n",
      "\n",
      "#check for different cases and display appropriate result\n",
      "if per >= 60:\n",
      "    print\"First division\"\n",
      "elif per >= 50:\n",
      "    print\"Second division\"\n",
      "elif per >= 40:\n",
      "    print\"Third division\"\n",
      "else:\n",
      "    print\"Fail\"\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter marks in five subjects: \n",
        "88 92 87 66 56\n",
        "First division\n"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.5 (Method 1) , Page number: 68<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''A company insures its drivers in the following cases:\n",
      "\u2212 If the driver is married.\n",
      "\u2212 If the driver is unmarried, male & above 30 years of age.\n",
      "\u2212 If the driver is unmarried, female & above 25 years of age.\n",
      "In all other cases the driver is not insured.\n",
      "If the marital status, sex and age of the driver are the inputs, write a program to determine whether the driver is to be insured or not.'''\n",
      "\n",
      "#input from user\n",
      "#age,sex,ms = raw_input(\"Enter age, sex, marital status: \").split() # Age , sex and marital status of the driver\n",
      "print \"Enter age, sex, marital status: \"\n",
      "age = 43 # Age of driver (years)\n",
      "sex = 'M'\n",
      "ms = 'M'\n",
      "print age,sex,ms\n",
      "#check for different cases and display appropriate result\n",
      "if ms == 'M':\n",
      "    print(\"Driver is insured\")\n",
      "else:\n",
      "    if sex == 'M':\n",
      "        if age > 30:\n",
      "            print (\"Driver is insured\")\n",
      "        else:\n",
      "            print (\"Driver is not insured\")\n",
      "    else:\n",
      "        if age > 25:\n",
      "            print (\"Driver is insured\")\n",
      "        else:\n",
      "            print (\"Driver is not insured\")\n",
      "                \n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter age, sex, marital status: \n",
        "43 M M\n",
        "Driver is insured\n"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.5 (Method 2) , Page number: 69<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''Using logical operators'''\n",
      "\n",
      "#input from user\n",
      "#age,sex,ms = raw_input(\"Enter age, sex, marital status: \").split() # Age , sex and marital status of the driver\n",
      "print \"Enter age, sex, marital status: \"\n",
      "age = 43 # Age of driver (years)\n",
      "sex = 'M'\n",
      "ms = 'M'\n",
      "print age,sex,ms\n",
      "\n",
      "#check for different cases and display appropriate result\n",
      "if ((ms == 'M') or (ms == 'U' and sex == 'M' and age > 30) or (ms == 'U' and sex == 'F' and age >25) ) :\n",
      "    print\"Driver is insured\"\n",
      "else:\n",
      "    print\"Driver is not insured\"\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter age, sex, marital status: \n",
        "43 M M\n",
        "Driver is insured\n"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "<h3>Example 2.6, Page number: 71<h3>"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "'''Write a program to calculate the salary as per the given table'''\n",
      "\n",
      "#Input gender( m/f), years of service and qualification from the user\n",
      "#g,yos,qual = raw_input(\"Enter Gender, Years of Service and Qualifications ( 0 = G, 1 = PG ):\").split()\n",
      "print \"Enter Gender, Years of Service and Qualifications ( 0 = G, 1 = PG ):\"\n",
      "g = 'f'\n",
      "yos = 8 # Years of service(years)\n",
      "qual = 1 # Qualification ( 0=G, 1=PG)\n",
      "print g,yos,qual\n",
      "\n",
      "# Assign salary depending upon the conditions\n",
      "if (g == 'm') and (yos >= 10) and (qual == 1):\n",
      "    sal = 15000 #salary\n",
      "elif ((g == 'm' and yos >= 10 and qual == 0) or ( g == 'm' and yos < 10 and qual == 1 )):\n",
      "    sal = 10000 #salary\n",
      "elif ( g == 'm' and yos < 10 and qual == 0 ):\n",
      "    sal = 7000  #salary\n",
      "elif ( g == 'f' and yos >= 10 and qual == 1 ):\n",
      "    sal = 12000 #salary\n",
      "elif ( g == 'f' and yos >= 10 and qual == 0 ):\n",
      "    sal = 9000  #salary\n",
      "elif ( g == 'f' and yos < 10 and qual == 1 ):\n",
      "    sal = 10000 #salary\n",
      "elif ( g == 'f' and yos < 10 and qual == 0 ):\n",
      "    sal = 6000  #salary\n",
      "\n",
      "#Result\n",
      "print  \"Salary of Employee = \", sal "
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enter Gender, Years of Service and Qualifications ( 0 = G, 1 = PG ):\n",
        "f 8 1\n",
        "Salary of Employee =  10000\n"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}