{
"metadata": {
"name": "",
"signature": "sha256:64b755d597a2016634dadbbc81a598a60446119cc89f4f94fd9140b5bc077b77"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 11: Object Initialization and clean up"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example- bag.cpp, Page-392"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"MAX_ITEMS=25\n",
"def show(self):\n",
" for i in range(self.ItemCount):\n",
" print self._Bag__contents[i],\n",
"class Bag:\n",
" __contents=[int]*MAX_ITEMS\n",
" __ItemCount=int\n",
" def SetEmpty(self):\n",
" self.ItemCount=0\n",
" def put(self,item):\n",
" self._Bag__contents[self.ItemCount]=item\n",
" self.ItemCount+=1\n",
" show=show\n",
"bag=Bag() #object of class Bag\n",
"bag.SetEmpty() #initialize the object\n",
"while 1:\n",
" item=int(raw_input(\"\\nEnter Item Number to be put into the bag <0-no item>: \"))\n",
" if item==0:\n",
" break\n",
" bag.put(item)\n",
" print \"Items in bag:\",\n",
" bag.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Items in bag: 1"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3 2"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3 2 4"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 0\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example- newbag.cpp, Page-395"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"MAX_ITEMS=25 #size of array contents\n",
"def show(self):\n",
" for i in range(self.ItemCount):\n",
" print self._Bag__contents[i],\n",
"class Bag:\n",
" __contents=[int]*MAX_ITEMS #int 1D array\n",
" __ItemCount=int\n",
" def __init__(self): #Constructor\n",
" self.ItemCount=0\n",
" def put(self,item): #member function defined inside the class\n",
" self._Bag__contents[self.ItemCount]=item\n",
" self.ItemCount+=1\n",
" show=show #member function defined outside the class\n",
"bag=Bag() #object of class Bag\n",
"while 1:\n",
" item=int(raw_input(\"\\nEnter Item Number to be put into the bag <0-no item>: \"))\n",
" if item==0:\n",
" break\n",
" bag.put(item)\n",
" print \"Items in bag:\",\n",
" bag.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Items in bag: 1"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3 2"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag: 1 3 2 4"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 0\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-test1.cpp, Page-396"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def __init__(self):\n",
" print \"Constructor of class test called\"\n",
"class Test:\n",
" __init__=__init__ #Constructor\n",
"G=Test()\n",
"def func():\n",
" L=Test()\n",
" print \"Here's function func()\"\n",
"X=Test()\n",
"print \"main() function\"\n",
"func()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Constructor of class test called\n",
"Constructor of class test called\n",
"main() function\n",
"Constructor of class test called\n",
"Here's function func()\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example- giftbag.cpp, Page- 398"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"MAX_ITEMS=25\n",
"def show(self):\n",
" if self.ItemCount:\n",
" for i in range(self.ItemCount):\n",
" print self._Bag__contents[i],\n",
" else:\n",
" print \"Nil\"\n",
"class Bag:\n",
" __contents=[int]*MAX_ITEMS\n",
" __ItemCount=int\n",
" def __init__(self, item=None): #parameterized constructor: Python does not support overloading of functions\n",
" if isinstance(item, int):\n",
" self._Bag__contents[0]=item\n",
" self.ItemCount=1\n",
" else:\n",
" self.ItemCount=0\n",
" def put(self,item):\n",
" self._Bag__contents[self.ItemCount]=item\n",
" self.ItemCount+=1\n",
" show=show\n",
"bag1=Bag()\n",
"bag2=Bag(4) #object created using the parameterized constructor\n",
"print \"Gifted bag1 initially has:\",\n",
"bag1.show()\n",
"print \"Gifted bag2 initially has:\",\n",
"bag2.show()\n",
"while 1:\n",
" item=int(raw_input(\"\\nEnter Item Number to be put into the bag <0-no item>: \"))\n",
" if item==0:\n",
" break\n",
" bag2.put(item)\n",
" print \"Items in bag2:\",\n",
" bag2.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Gifted bag1 initially has: Nil\n",
"Gifted bag2 initially has: 4"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag2: 4 1"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag2: 4 1 2"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Items in bag2: 4 1 2 3"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter Item Number to be put into the bag <0-no item>: 0\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-test.cpp, Page-400 "
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def __init__(self):\n",
" print \"Constructor of class Test called\"\n",
"def __del__(self):\n",
" print \"Destructor of class Test called\"\n",
"class Test:\n",
" __init__=__init__ #Constructor\n",
" __del__=__del__ #Destructor\n",
"x=Test()\n",
"print \"Terminating main\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Constructor of class Test called\n",
"Destructor of class Test called\n",
"Terminating main\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-count.cpp, Page-401"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"nobjects=0\n",
"nobj_alive=0\n",
"class MyClass:\n",
" def __init__(self):\n",
" global nobjects #using the global nobjects\n",
" global nobj_alive #using the global nobj_alive\n",
" nobjects+=1\n",
" nobj_alive+=1\n",
" def __del__(self):\n",
" global nobj_alive #using the global nobjects\n",
" nobj_alive-=1\n",
" def show(self):\n",
" global nobjects\n",
" global nobj_alive\n",
" print \"Total number of objects created: \", nobjects\n",
" print \"Number of objects currently alive: \", nobj_alive\n",
"obj1=MyClass()\n",
"obj1.show()\n",
"def func():\n",
" obj1=MyClass()\n",
" obj2=MyClass()\n",
" obj2.show()\n",
" del obj1\n",
" del obj2\n",
"func()\n",
"obj1.show()\n",
"obj2=MyClass()\n",
"obj3=MyClass()\n",
"obj2.show()\n",
"del obj1\n",
"del obj2\n",
"del obj3"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Total number of objects created: 1\n",
"Number of objects currently alive: 1\n",
"Total number of objects created: 3\n",
"Number of objects currently alive: 3\n",
"Total number of objects created: 3\n",
"Number of objects currently alive: 1\n",
"Total number of objects created: 5\n",
"Number of objects currently alive: 3\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Example-account.cpp, Page- 403"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def MoneyTransfer(self, acc , amount):\n",
" self._AccClass__balance=self._AccClass__balance-amount\n",
" acc._AccClass__balance=acc._AccClass__balance + amount\n",
"class AccClass:\n",
" __accno=int\n",
" __balance=float\n",
" def __init__(self, an=None, bal=0.0):\n",
" if isinstance(an, int):\n",
" self.accno=an\n",
" self.__balance=bal\n",
" else:\n",
" self.accno=raw_input(\"Enter account number for acc1 object: \")\n",
" self.__balance=float(raw_input(\"Enter the balance: \"))\n",
" def display(self):\n",
" print \"Acoount number is: \", self.accno\n",
" print \"Balance is: \", self.__balance\n",
" MoneyTransfer=MoneyTransfer\n",
"acc1=AccClass()\n",
"acc2=AccClass(10)\n",
"acc3=AccClass(20, 750.5)\n",
"print \"Acoount information...\"\n",
"acc1.display()\n",
"acc2.display()\n",
"acc3.display()\n",
"trans_money=float(raw_input(\"How much money is to be transferred from acc3 to acc1: \"))\n",
"acc3.MoneyTransfer(acc1, trans_money)\n",
"print \"Updated information about accounts...\"\n",
"acc1.display()\n",
"acc2.display()\n",
"acc3.display()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter account number for acc1 object: 1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the balance: 100\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Acoount information...\n",
"Acoount number is: 1\n",
"Balance is: 100.0\n",
"Acoount number is: 10\n",
"Balance is: 0.0\n",
"Acoount number is: 20\n",
"Balance is: 750.5\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How much money is to be transferred from acc3 to acc1: 200\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Updated information about accounts...\n",
"Acoount number is: 1\n",
"Balance is: 300.0\n",
"Acoount number is: 10\n",
"Balance is: 0.0\n",
"Acoount number is: 20\n",
"Balance is: 550.5\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-test2.cpp. Page- 405"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def __init__(self, NameIn=None):\n",
" if isinstance(NameIn, str):\n",
" self.name=NameIn\n",
" print \"Test Object \", NameIn, \" created\"\n",
" else:\n",
" self.name=\"unnamed\"\n",
" print \"Test object 'unnamed' created\"\n",
"def __del__(self):\n",
" print \"Test Object \", self.name, \" destroyed\"\n",
" del self.name\n",
"class Test:\n",
" __name=[str]\n",
" __init__=__init__\n",
" __del__=__del__\n",
"g=Test(\"global\")\n",
"def func():\n",
" l=Test(\"func\")\n",
" print \"here's function func()\"\n",
"x=Test(\"main\")\n",
"func()\n",
"print \"main() function - termination\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Test Object global created\n",
"Test Object global destroyed\n",
"Test Object main created\n",
"Test Object main destroyed\n",
"Test Object func created\n",
"here's function func()\n",
"Test Object func destroyed\n",
"main() function - termination\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-complex1.cpp, Page- 407"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"def add (self, c2):\n",
" temp=Complex()\n",
" temp._Complex__real=self._Complex__real+c2._Complex__real\n",
" temp._Complex__imag=self._Complex__imag+c2._Complex__imag\n",
" return temp\n",
"class Complex:\n",
" __real=float\n",
" __imag=float\n",
" def __init__(self, real_in=None, imag_in=0.0):\n",
" if isinstance(real_in, float):\n",
" self.__real=real_in\n",
" self.__imag=imag_in\n",
" else:\n",
" self.__real=self.__imag=0.0\n",
" def show(self, msg):\n",
" print msg, \n",
" print self.__real,\n",
" if self.__imag<0:\n",
" print \"-i\",\n",
" else:\n",
" print \"+i\",\n",
" print math.fabs(self.__imag) #print absolute value\n",
" add=add\n",
"c1=Complex(1.5,2.0)\n",
"c2=Complex(2.2)\n",
"c3=Complex()\n",
"c1.show(\"c1=\")\n",
"c2.show(\"c2=\")\n",
"c3=c1.add(c2)\n",
"c3.show(\"c3=c1.add(c2):\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"c1= 1.5 +i 2.0\n",
"c2= 2.2 +i 0.0\n",
"c3=c1.add(c2): 3.7 +i 2.0\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example- noname.cpp, Page- 410"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class nameless:\n",
" __a=int\n",
" def __init__(self):\n",
" print \"Constructor\"\n",
" def __del__(self):\n",
" print \"Destructor\"\n",
"nameless() #nameless object created\n",
"n1=nameless()\n",
"n2=nameless()\n",
"print \"Program terminates\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Constructor\n",
"Destructor\n",
"Constructor\n",
"Destructor\n",
"Constructor\n",
"Destructor\n",
"Program terminates\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-name.cpp, Page-411"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def show(self, msg):\n",
" print msg\n",
" print \"First Name: \", self._name__first\n",
" if self._name__middle[0]:\n",
" print \"Middle Name: \", self._name__middle\n",
" if self._name__last[0]:\n",
" print \"Last Name: \", self._name__last\n",
"class name:\n",
" __first=[None]*15\n",
" __middle=[None]*15\n",
" __last=[None]*15\n",
" def __init__(self, FirstName=None, MiddleName=None, LastName=None):\n",
" if isinstance(LastName, str):\n",
" self.__last=LastName\n",
" self.__middle=MiddleName\n",
" self.__first=FirstName\n",
" elif isinstance(MiddleName, str):\n",
" self.__middle=MiddleName\n",
" self.__first=FirstName\n",
" elif isinstance(FirstName, str):\n",
" self.__first=FirstName\n",
" else:\n",
" self.__last='\\0' #initialized to NULL\n",
" self.__middle='\\0'\n",
" self.__first='\\0'\n",
" show=show\n",
"n1=name()\n",
"n2=name()\n",
"n3=name()\n",
"n1=name(\"Rajkumar\")\n",
"n2=name(\"Savithri\", \"S\")\n",
"n3=name(\"Veugopal\", \"K\", \"R\")\n",
"n1.show(\"First prson details...\")\n",
"n2.show(\"Second prson details...\")\n",
"n3.show(\"Third prson details...\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"First prson details...\n",
"First Name: Rajkumar\n",
"Second prson details...\n",
"First Name: Savithri\n",
"Middle Name: S\n",
"Third prson details...\n",
"First Name: Veugopal\n",
"Middle Name: K\n",
"Last Name: R\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-vector1.cpp, Page-413"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def read(self):\n",
" for i in range(self._vector__sz):\n",
" print \"Enter vector [\", i, \"]? \",\n",
" self._vector__v[i]=int(raw_input())\n",
"def show_sum(self):\n",
" Sum=0\n",
" for i in range(self._vector__sz):\n",
" Sum+=self._vector__v[i]\n",
" print \"Vector sum= \", Sum\n",
"class vector:\n",
" __v=[int] #array of type integer\n",
" __sz=int\n",
" def __init__(self, size):\n",
" self.__sz= size\n",
" self.__v=[int]*size #dynamically allocating size to integer array\n",
" def __del__(self):\n",
" del self.__v\n",
" read=read\n",
" show_sum=show_sum\n",
"count = int\n",
"count=int(raw_input(\"How many elements are there in the vector: \"))\n",
"v1= vector(count)\n",
"v1.read()\n",
"v1.show_sum()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many elements are there in the vector: 5\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter vector [ 0 ]? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter vector [ 1 ]? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter vector [ 2 ]? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter vector [ 3 ]? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter vector [ 4 ]? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"5\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Vector sum= 15\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-vector2.cpp, Page-415"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def show(self):\n",
" for i in range(self._vector__size):\n",
" print self.elem(i), \", \",\n",
"class vector:\n",
" __v=[int]\n",
" __size=int\n",
" def __init__(self, vector_size):\n",
" if isinstance(vector_size, int):\n",
" self.__size= vector_size\n",
" self.__v=[int]*vector_size\n",
" else:\n",
" print \"Copy construcor invoked\"\n",
" self.__size=vector_size.__size\n",
" self.__v=[int]*vector_size.__size\n",
" for i in range(vector_size.__size):\n",
" self.__v[i]=vector_size.__v[i]\n",
" def elem(self,i):\n",
" if i>=self.__size:\n",
" print \"Error: Out of Range\"\n",
" return -1\n",
" return self.__v[i]\n",
" def __del__(self):\n",
" del self.__v\n",
" show=show\n",
"v1=vector(5)\n",
"v2=vector(5)\n",
"for i in range(5):\n",
" if v2.elem(i)!=-1:\n",
" v2._vector__v[i]=i+1\n",
"v1=v2\n",
"v3=vector(v2)\n",
"print \"Vector v1: \",\n",
"v1.show()\n",
"print \"\\nvector v2: \",\n",
"v2.show()\n",
"print \"\\nvector v3: \",\n",
"v3.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Copy construcor invoked\n",
"Vector v1: 1 , 2 , 3 , 4 , 5 , \n",
"vector v2: 1 , 2 , 3 , 4 , 5 , \n",
"vector v3: 1 , 2 , 3 , 4 , 5 , \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-matrix.cpp, Page-418"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"TRUE=1\n",
"FALSE=0\n",
"def __del__(self):\n",
" for i in range(self._matrix__MaxRow):\n",
" del self._matrix__p[i]\n",
" del self._matrix__p\n",
"def add(self, a, b):\n",
" self._matrix__MaxRow=a._matrix__MaxRow\n",
" self._matrix__MaxCol=a._matrix__MaxCol\n",
" if (a._matrix__MaxRow!=b._matrix__MaxRow)|(a._matrix__MaxCol!=b._matrix__MaxCol):\n",
" print \"Error: invalid matrix order for addition\"\n",
" return\n",
" for i in range(self._matrix__MaxRow):\n",
" for j in range(self._matrix__MaxCol):\n",
" self._matrix__p[i][j]=a._matrix__p[i][j]+b._matrix__p[i][j]\n",
"def sub(self, a, b):\n",
" self._matrix__MaxRow=a._matrix__MaxRow\n",
" self._matrix__MaxCol=a._matrix__MaxCol\n",
" if (a._matrix__MaxRow!=b._matrix__MaxRow)|(a._matrix__MaxCol!=b._matrix__MaxCol):\n",
" print \"Error: invalid matrix order for subtraction\"\n",
" return\n",
" for i in range(self._matrix__MaxRow):\n",
" for j in range(self._matrix__MaxCol):\n",
" self._matrix__p[i][j]=a._matrix__p[i][j]-b._matrix__p[i][j]\n",
"def mul(self, a, b):\n",
" self._matrix__MaxRow=a._matrix__MaxRow\n",
" self._matrix__MaxCol=a._matrix__MaxCol\n",
" if (a._matrix__MaxCol!=b._matrix__MaxRow):\n",
" print \"Error: invalid matrix order for multiplication\"\n",
" return\n",
" for i in range(a._matrix__MaxRow):\n",
" for j in range(b._matrix__MaxCol):\n",
" self._matrix__p[i][j]=0\n",
" for k in range(a._matrix__MaxCol):\n",
" self._matrix__p[i][j]+=a._matrix__p[i][j]*b._matrix__p[i][j]\n",
"def eql(self, b):\n",
" for i in range(self._matrix__MaxRow):\n",
" for j in range(self._matrix__MaxCol):\n",
" if self._matrix__p[i][i]!=b._matrix__p[i][j]:\n",
" return 0\n",
" return 1\n",
"def read(self):\n",
" for i in range(self._matrix__MaxRow):\n",
" for j in range(self._matrix__MaxCol):\n",
" print \"Matrix[\", i, \",\",j,\"] =? \",\n",
" self._matrix__p[i][j]=int(raw_input())\n",
"def show(self):\n",
" for i in range(self._matrix__MaxRow):\n",
" for j in range(self._matrix__MaxCol):\n",
" print self._matrix__p[i][j], \" \",\n",
" print \"\"\n",
"class matrix:\n",
" __MaxRow=int\n",
" __MaxCol=int\n",
" __p=[int]\n",
" def __init__(self, row=0, col=0):\n",
" self.__MaxRow=row\n",
" self.__MaxCol=col\n",
" if row>0:\n",
" self.__p=[[int]*self.__MaxCol]*self.__MaxRow\n",
" __del__=__del__\n",
" read=read\n",
" show=show\n",
" add=add\n",
" sub=sub\n",
" mul=mul\n",
" eql=eql\n",
"print \"Enter Matrix A details...\"\n",
"m=int(raw_input(\"How many rows? \"))\n",
"n=int(raw_input(\"How many columns? \"))\n",
"a=matrix(m,n)\n",
"a.read()\n",
"print \"Enter Matrix B details...\"\n",
"p=int(raw_input(\"How many rows? \"))\n",
"q=int(raw_input(\"How many columns? \"))\n",
"b=matrix(p,q)\n",
"b.read()\n",
"print \"Matrix A is...\"\n",
"a.show()\n",
"print \"Matrix B is...\"\n",
"b.show()\n",
"c=matrix(m,n)\n",
"c.add(a,b)\n",
"print \"C=A+B...\"\n",
"c.show()\n",
"d=matrix(m,n)\n",
"d.sub(a,b)\n",
"print \"D=A-B...\"\n",
"d.show()\n",
"e=matrix(m,q)\n",
"e.mul(a,b)\n",
"print \"E=A*B...\"\n",
"e.show()\n",
"print \"(Is matrix A equal to matrix B)? \",\n",
"if(a.eql(b)):\n",
" print \"Yes\"\n",
"else:\n",
" print \"No\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter Matrix A details...\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many rows? 3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many columns? 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Matrix[ 0 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 0 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 0 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter Matrix B details...\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many rows? 3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many columns? 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Matrix[ 0 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 0 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 0 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 1 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 0 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 1 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix[ 2 , 2 ] =? "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Matrix A is...\n",
"2 2 2 \n",
"2 2 2 \n",
"2 2 2 \n",
"Matrix B is...\n",
"1 1 1 \n",
"1 1 1 \n",
"1 1 1 \n",
"C=A+B...\n",
"3 3 3 \n",
"3 3 3 \n",
"3 3 3 \n",
"D=A-B...\n",
"1 1 1 \n",
"1 1 1 \n",
"1 1 1 \n",
"E=A*B...\n",
"6 6 6 \n",
"6 6 6 \n",
"6 6 6 \n",
"(Is matrix A equal to matrix B)? No\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-person.cpp, Page-423"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def __init__(self, NameIn, AddressIn, PhoneIn):\n",
" self._Person__name=NameIn\n",
" self._Person__address=AddressIn\n",
" self._Person__phone=PhoneIn\n",
"#inline\n",
"def __del__(self):\n",
" del self._Person__name\n",
" del self._Person__address\n",
" del self._Person__phone\n",
"def getname(self):\n",
" return self._Person__name\n",
"def getaddress(self):\n",
" return self._Person__address\n",
"def getphone(self):\n",
" return self._Person__phone\n",
"def changename(self, NameIn):\n",
" if(self._Person__name):\n",
" del self._Person__name\n",
" self._Person__name=NameIn\n",
"class Person:\n",
" __name=[str]\n",
" __address=[str]\n",
" __phone=[str]\n",
" __init__=__init__\n",
" __del__=__del__\n",
" getname=getname\n",
" getaddress=getaddress\n",
" getphone=getphone\n",
" changename=changename\n",
"def printperson(p):\n",
" if(p.getname()):\n",
" print \"Name: \", p.getname()\n",
" if(p.getaddress()):\n",
" print \"Address: \", p.getaddress()\n",
" if(p.getphone()):\n",
" print \"Phone: \", p.getphone()\n",
"me=Person(\"Rajkumar\", \"E-mail: raj@cdabc.erne.in\", \"91-080-5584271\")\n",
"printperson(me)\n",
"you=Person(\"XYZ\", \"-not sure-\", \"-not sure-\")\n",
"print \"You XYZ by default...\"\n",
"printperson(you)\n",
"you.changename(\"ABC\")\n",
"print \"You changed XYZ to ABC...\"\n",
"printperson(you)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Name: Rajkumar\n",
"Address: E-mail: raj@cdabc.erne.in\n",
"Phone: 91-080-5584271\n",
"You XYZ by default...\n",
"Name: XYZ\n",
"Address: -not sure-\n",
"Phone: -not sure-\n",
"You changed XYZ to ABC...\n",
"Name: ABC\n",
"Address: -not sure-\n",
"Phone: -not sure-\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example-graph.cpp, Page-425"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def __init__(self):\n",
" if(self._Graphics__nobjects[0]==False):\n",
" self._Graphics__setgraphicsmode()\n",
" self._Graphics__nobjects[0]+=1\n",
"def __del__(self):\n",
" self._Graphics__nobjects[0]-=1\n",
" if(self._Graphics__nobjects[0]==False):\n",
" self._Graphics__settextmode()\n",
"class Graphics:\n",
" __nobjects=[0]\n",
" def __setgraphicsmode(self):\n",
" pass\n",
" def __settextmode(self):\n",
" pass\n",
" __init__=__init__\n",
" __del__=__del__\n",
" def getcount(self):\n",
" return self.__nobjects[0]\n",
"def my_func():\n",
" obj=Graphics()\n",
" print \"No. of Graphics' objects while in my_func=\", obj.getcount()\n",
"obj1=Graphics()\n",
"print \"No. of Graphics' objects before in my_func=\", obj1.getcount()\n",
"my_func()\n",
"print \"No. of Graphics' objects after in my_func=\", obj1.getcount()\n",
"obj2=Graphics()\n",
"obj3=Graphics()\n",
"obj4=Graphics()\n",
"print \"Value of static member nobjects after all 3 more objects...\"\n",
"print \"In obj1= \", obj1.getcount()\n",
"print \"In obj2= \", obj2.getcount()\n",
"print \"In obj3= \", obj3.getcount()\n",
"print \"In obj4= \", obj4.getcount()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"No. of Graphics' objects before in my_func= 1\n",
"No. of Graphics' objects while in my_func= 2\n",
"No. of Graphics' objects after in my_func= 1\n",
"Value of static member nobjects after all 3 more objects...\n",
"In obj1= 4\n",
"In obj2= 4\n",
"In obj3= 4\n",
"In obj4= 4\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Page-428"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def distance(self, a, b):\n",
" self.x=a.x-b.x\n",
" self.y=a.y-b.y\n",
"def display(self):\n",
" print \"x= \",self.x\n",
" print \"y= \", self.y\n",
"class point:\n",
" __x=int\n",
" __y=int\n",
" def __init__(self, a=None, b=None):\n",
" if isinstance(a, int):\n",
" self.x=a\n",
" self.y=b\n",
" else:\n",
" self.x=self.y=0\n",
" def __del__(self):\n",
" pass\n",
" distance=distance\n",
" display=display\n",
"p1=point(40,18)\n",
"p2=point(12,9)\n",
"p3=point()\n",
"p3.distance(p1,p2)\n",
"print \"Coordinates of P1: \"\n",
"p1.display()\n",
"print \"Coordinates of P2: \"\n",
"p2.display()\n",
"print \"distance between P1 and P2: \"\n",
"p3.display()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Coordinates of P1: \n",
"x= 40\n",
"y= 18\n",
"Coordinates of P2: \n",
"x= 12\n",
"y= 9\n",
"distance between P1 and P2: \n",
"x= 28\n",
"y= 9\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Page-430"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def display(self):\n",
" print \"a =\", self.a,\n",
" print \"b =\", self.b\n",
"class data:\n",
" __a=int\n",
" __b=float\n",
" def __init__(self, x=None, y=None):\n",
" if isinstance(x, int):\n",
" self.a=x\n",
" self.b=y\n",
" elif isinstance(x, data):\n",
" self.a=x.a\n",
" self.b=x.b\n",
" else:\n",
" self.a=0\n",
" self.b=0\n",
" display=display\n",
"d1=data()\n",
"d2=data(12,9.9)\n",
"d3=data(d2)\n",
"print \"For default constructor: \"\n",
"d1.display()\n",
"print\"For parameterized constructor: \"\n",
"d2.display()\n",
"print \"For Copy Constructor: \"\n",
"d3.display()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"For default constructor: \n",
"a = 0 b = 0\n",
"For parameterized constructor: \n",
"a = 12 b = 9.9\n",
"For Copy Constructor: \n",
"a = 12 b = 9.9\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}