{
"metadata": {
"name": ""
},
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 9 : Advanced Classes and Dynamic Memory: Game Lobby"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 9.1 page no : 288"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"class Critter:\n",
" def __init__(self,name=\"\"):\n",
" self.m_Name = name\n",
"\n",
" def GetName(self):\n",
" return self.m_Name;\n",
"\n",
"class Farm:\n",
" def __init__(self,spaces = 1):\n",
" self.m_Critters = []\n",
"\n",
" def Add(self,aCritter):\n",
" self.m_Critters.append(aCritter);\n",
"\n",
" def RollCall(self):\n",
" for i in self.m_Critters:\n",
" print i.GetName() , \" here.\";\n",
"\n",
"crit = Critter(\"Poochie\");\n",
"print \"My critter's name is \" , crit.GetName()\n",
"print \"\\nCreating critter farm.\";\n",
"myFarm = Farm(3)\n",
"print \"Adding three critters to the farm.\";\n",
"myFarm.Add(Critter(\"Moe\"));\n",
"myFarm.Add(Critter(\"Larry\"));\n",
"myFarm.Add(Critter(\"Curly\"));\n",
"print \"Calling Roll. . .\";\n",
"myFarm.RollCall();"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"My critter's name is Poochie\n",
"\n",
"Creating critter farm.\n",
"Adding three critters to the farm.\n",
"Calling Roll. . .\n",
"Moe here.\n",
"Larry here.\n",
"Curly here.\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 9.2 page no : 293"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class Critter:\n",
" def __init__(self,name=\"\"):\n",
" self.m_Name = name\n",
"\n",
" def GetName(self):\n",
" return self.m_Name;\n",
"\n",
"\n",
"def Peek(aCritter):\n",
" print aCritter.m_Name\n",
"\n",
"def print_(aCritter):\n",
" print \"Critter Object - \",\n",
" print \"m_Name: \" , aCritter.m_Name,\n",
"\n",
"\n",
"crit = Critter(\"Poochie\");\n",
"print \"Calling Peek() to access crit's private data member, m_Name: \";\n",
"Peek(crit);\n",
"print \"Sending crit object to cout with the , operator:\";\n",
"print_(crit)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Calling Peek() to access crit's private data member, m_Name: \n",
"Poochie\n",
"Sending crit object to cout with the , operator:\n",
"Critter Object - m_Name: Poochie\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 9.3 page no : 297"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def intOnHeap():\n",
" pTemp = []\n",
" return pTemp;\n",
"\n",
"def leak1():\n",
" drip1 = []\n",
"\n",
"def leak2():\n",
" drip2 = []\n",
"\n",
"\n",
"pHeap = 10;\n",
"print \"*pHeap: \" , pHeap\n",
"pHeap2 = intOnHeap();\n",
"print \"pHeap2: \" , pHeap2 \n",
"print \"Freeing memory pointed to by pHeap.\"; # python automatically deletes the memory.\n",
"print \"Freeing memory pointed to by pHeap2.\";\n",
"pHeap = 0;\n",
"pHeap2 = 0;"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"*pHeap: 10\n",
"pHeap2: []\n",
"Freeing memory pointed to by pHeap.\n",
"Freeing memory pointed to by pHeap2.\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 9.4 page no : 304"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"\n",
"class Critter:\n",
" def __init__(self,name=None,age=None):\n",
" if (age!=None and name != None) or (age==None and name==None):\n",
" print \"Constructor called\";\n",
" self.m_pName = name\n",
" self.m_Age = age\n",
" else:\n",
" print \"Copy Constructor called\";\n",
" self.m_pName = name.m_pName\n",
" self.m_Age = name.m_Age;\n",
"\n",
" def GetName(self):\n",
" return self.m_Name;\n",
"\n",
" def __del__(self):\n",
" print \"Destructor called\\n\";\n",
"\n",
" def operator(self,c):\n",
" print \"Overloaded Assignment Operator called\";\n",
" return self\n",
" \n",
" def Greet(self):\n",
" print \"I'm \" , self.m_pName , \" and I'm \" , self.m_Age , \" years old.\";\n",
" print \"&m_pName: \" , \n",
" print id(self.m_pName)\n",
"\n",
"\n",
"def testDestructor():\n",
" toDestroy = Critter(\"Rover\", 3);\n",
" toDestroy.Greet(); \n",
"\n",
"def testCopyConstructor(aCopy):\n",
" aCopy.Greet();\n",
"\n",
"def testAssignmentOp():\n",
" crit1 = Critter(\"crit1\", 7);\n",
" crit2 = Critter(\"crit2\", 9);\n",
" crit1 = crit2;\n",
" crit1.Greet();\n",
" crit2.Greet();\n",
" crit3 = Critter(\"crit\", 11);\n",
" crit3 = crit3;\n",
" crit3.Greet();\n",
"\n",
"testDestructor();\n",
"print ''\n",
"crit = Critter(\"Poochie\", 5);\n",
"crit.Greet();\n",
"testCopyConstructor(crit);\n",
"crit.Greet();\n",
"print ''\n",
"testAssignmentOp();"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Constructor called\n",
"I'm Rover and I'm 3 years old.\n",
"&m_pName: 30745776\n",
"Destructor called\n",
"\n",
"\n",
"Constructor called\n",
"I'm Poochie and I'm 5 years old.\n",
"&m_pName: 30744672\n",
"I'm Poochie and I'm 5 years old.\n",
"&m_pName: 30744672\n",
"I'm Poochie and I'm 5 years old.\n",
"&m_pName: 30744672\n",
"\n",
"Constructor called\n",
"Constructor called\n",
"Destructor called\n",
"\n",
"I'm crit2 and I'm 9 years old.\n",
"&m_pName: 30725152\n",
"I'm crit2 and I'm 9 years old.\n",
"&m_pName: 30725152\n",
"Constructor called\n",
"I'm crit and I'm 11 years old.\n",
"&m_pName: 30744624\n",
"Destructor called\n",
"\n",
"Destructor called\n",
"\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"example 9.5 and 9.6 page no : 318"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class Player:\n",
" def __init__(self,name):\n",
" self.m_Name =name\n",
" self.m_pNext = 0\n",
"\n",
" def GetName(self):\n",
" return self.m_Name;\n",
"\n",
" def GetNext(self):\n",
" return self.m_pNext;\n",
"\n",
" def SetNext(self,next):\n",
" self.m_pNext = next;\n",
" \n",
"class Lobby:\n",
" def __init__(self):\n",
" self.m_pHead =0\n",
"\n",
" def __del__(self):\n",
" self.Clear();\n",
"\n",
" def AddPlayer(self):\n",
" #create a new player node\n",
" print \"Please enter the name of the new player: \",\n",
" name = 'abc' #raw_input()\n",
" pNewPlayer = Player(name);\n",
" #if list is empty, make head of list this new player\n",
" if (self.m_pHead == 0):\n",
" self.m_pHead = pNewPlayer;\n",
" #otherwise find the end of the list and add the player there\n",
" else:\n",
" pIter = self.m_pHead;\n",
" while (pIter.GetNext() != 0):\n",
" pIter = pIter.GetNext();\n",
" pIter.SetNext(pNewPlayer);\n",
" \n",
" def RemovePlayer(self):\n",
" if (self.m_pHead == 0):\n",
" print \"The game lobby is empty.\"\n",
" else:\n",
" pTemp = self.m_pHead;\n",
" self.m_pHead = self.m_pHead.GetNext();\n",
"\n",
" def Clear(self):\n",
" while (self.m_pHead != 0):\n",
" RemovePlayer();\n",
"\n",
" def print_(self):\n",
" pIter = self.m_pHead;\n",
"\n",
" print \"Here's who's in the game lobby:\";\n",
" if (pIter == 0):\n",
" print \"The lobby is empty.\\n\";\n",
" else:\n",
" while (pIter != 0):\n",
" print pIter.GetName()\n",
" pIter = pIter.GetNext();\n",
"\n",
"myLobby = Lobby()\n",
"choice = 1 \n",
"choices = [1,2,3,0]\n",
"i = 0\n",
"while (choice != 0):\n",
" print myLobby.print_();\n",
" print \"\\nGAME LOBBY\";\n",
" print \"0 - Exit the program.\";\n",
" print \"1 - Add a player to the lobby.\";\n",
" print \"2 - Remove a player from the lobby.\";\n",
" print \"3 - Clear the lobby.\";\n",
" print \"\\nEnter choice: \",\n",
" choice = choices[i] #int(raw_input())\n",
" i += 1\n",
" if choice ==0:\n",
" print \"Good-bye.\"\n",
" elif choice ==1: \n",
" myLobby.AddPlayer()\n",
" elif choice==2: \n",
" myLobby.RemovePlayer(); \n",
" elif choice==3: \n",
" myLobby.Clear()\n",
" else:\n",
" print \"That was not a valid choice.\\n\";"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Here's who's in the game lobby:\n",
"The lobby is empty.\n",
"\n",
"None\n",
"\n",
"GAME LOBBY\n",
"0 - Exit the program.\n",
"1 - Add a player to the lobby.\n",
"2 - Remove a player from the lobby.\n",
"3 - Clear the lobby.\n",
"\n",
"Enter choice: Please enter the name of the new player: Here's who's in the game lobby:\n",
"abc\n",
"None\n",
"\n",
"GAME LOBBY\n",
"0 - Exit the program.\n",
"1 - Add a player to the lobby.\n",
"2 - Remove a player from the lobby.\n",
"3 - Clear the lobby.\n",
"\n",
"Enter choice: Here's who's in the game lobby:\n",
"The lobby is empty.\n",
"\n",
"None\n",
"\n",
"GAME LOBBY\n",
"0 - Exit the program.\n",
"1 - Add a player to the lobby.\n",
"2 - Remove a player from the lobby.\n",
"3 - Clear the lobby.\n",
"\n",
"Enter choice: Here's who's in the game lobby:\n",
"The lobby is empty.\n",
"\n",
"None\n",
"\n",
"GAME LOBBY\n",
"0 - Exit the program.\n",
"1 - Add a player to the lobby.\n",
"2 - Remove a player from the lobby.\n",
"3 - Clear the lobby.\n",
"\n",
"Enter choice: Good-bye.\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}