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Diffstat (limited to 'C++_from_the_Ground/Chapter_17.ipynb')
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diff --git a/C++_from_the_Ground/Chapter_17.ipynb b/C++_from_the_Ground/Chapter_17.ipynb new file mode 100644 index 00000000..c50f48aa --- /dev/null +++ b/C++_from_the_Ground/Chapter_17.ipynb @@ -0,0 +1,730 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:636fe844c88ef46d09064f199c6b3a4c62e262611a41cc6f126f08459b94982e" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h1>Chapter 17: Exception Handling<h1>" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.1, Page Number: 397<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "print \"start\"\n", + "\n", + "try: #start a try block\n", + " print \"Inside try block\"\n", + " raise Exception(99) #raise an error\n", + " print \"This will not execute\"\n", + "except Exception,i: #catch an error\n", + " print \"Caught an exception -- value is:\",\n", + " print i\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Inside try block\n", + "Caught an exception -- value is: 99\n", + "end\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.2, Page Number: 399<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "\n", + "import sys\n", + "\n", + "\n", + "\n", + "def main():\n", + " print \"start\"\n", + " try: #start a try block\n", + " print \"Inside try block\"\n", + " raise Exception(99) #raise an error\n", + " print \"This will not execute\"\n", + " except Exception,i: #catch an error\n", + " if isinstance(i,float):\n", + " print \"Caught an exception -- value is:\",\n", + " print i\n", + " else:\n", + " print \"Abnormal program termination\"\n", + " return\n", + " print \"end\"\n", + "\n", + " \n", + "main()" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Inside try block\n", + "Abnormal program termination\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.3, Page Number: 400<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "def Xtest(test):\n", + " print \"Inside Xtest, test is: \",test\n", + " if(test):\n", + " raise Exception(test)\n", + " \n", + "print \"start\"\n", + "\n", + "try: #start a try block\n", + " print \"Inside try block\"\n", + " Xtest(0)\n", + " Xtest(1)\n", + " Xtest(2)\n", + "except Exception,i: #catch an error\n", + " print \"Caught an exception -- value is:\",\n", + " print i\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Inside try block\n", + "Inside Xtest, test is: 0\n", + "Inside Xtest, test is: 1\n", + "Caught an exception -- value is: 1\n", + "end\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.4, Page Number: 401<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "def Xhandler(test):\n", + " try:\n", + " if(test):\n", + " raise Exception(test)\n", + " except Exception,i:\n", + " print \"Caught One! Ex #:\",i\n", + " \n", + "print \"start\"\n", + "\n", + "Xhandler(1)\n", + "Xhandler(2)\n", + "Xhandler(0)\n", + "Xhandler(3)\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caught One! Ex #: 1\n", + "Caught One! Ex #: 2\n", + "Caught One! Ex #: 3\n", + "end\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.5, Page Number: 401<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "\n", + "class MyException:\n", + " def __init__(self,s):\n", + " self.str_what=s\n", + " \n", + "#Variable declaration\n", + "a=None \n", + "b=None\n", + "\n", + "try:\n", + " print \"Enter numerator and denominator:\"\n", + " #User-input\n", + " a=10 \n", + " b=0\n", + " if not(b):\n", + " raise MyException(\"Cannot divide by zero!\")\n", + " else:\n", + " print \"Quotient is\",a/b\n", + "except MyException as e: #catch an error\n", + " print e.str_what\n", + " " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Enter numerator and denominator:\n", + "Cannot divide by zero!\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.6, Page Number: 403<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "class MyException:\n", + " def __init__(self,s):\n", + " self.x=s\n", + " \n", + "def Xhandler(test):\n", + " try:\n", + " if(test):\n", + " raise MyException(test)\n", + " else:\n", + " raise MyException(\"Value is zero\")\n", + " except MyException as i:\n", + " if isinstance(i.x,int):\n", + " print \"Caught One! Ex #:\",i.x\n", + " else:\n", + " print \"Caught a string:\",\n", + " print i.x\n", + " \n", + "print \"start\"\n", + "\n", + "Xhandler(1)\n", + "Xhandler(2)\n", + "Xhandler(0)\n", + "Xhandler(3)\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caught One! Ex #: 1\n", + "Caught One! Ex #: 2\n", + "Caught a string: Value is zero\n", + "Caught One! Ex #: 3\n", + "end\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.7, Page Number: 404<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "\n", + "class B:\n", + " pass\n", + "\n", + "class D(B):\n", + " pass\n", + "\n", + "derived=D()\n", + "\n", + "try:\n", + " raise B()\n", + "except B as b:\n", + " print \"Caught a base class.\"\n", + "except D as d:\n", + " print \"This wont execute.\"\n", + " " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Caught a base class.\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.8, Page Number: 405<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "def Xhandler(test):\n", + " try:\n", + " if test==0:\n", + " raise Exception(test) #throw int\n", + " if test==1:\n", + " raise Exception('a') #throw char\n", + " if test==2:\n", + " raise Exception(123.23) #throw double\n", + " except: #Catches all exceptions\n", + " print \"Caught One!\"\n", + "\n", + "print \"start\"\n", + "\n", + "Xhandler(0)\n", + "Xhandler(1)\n", + "Xhandler(2)\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caught One!\n", + "Caught One!\n", + "Caught One!\n", + "end\n" + ] + } + ], + "prompt_number": 7 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.9, Page Number: 405<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "class MyException:\n", + " def __init__(self,s):\n", + " self.x=s\n", + " \n", + "def Xhandler(test):\n", + " try:\n", + " if test==0:\n", + " raise MyException(test) #throw int\n", + " if test==1:\n", + " raise MyException('a') #throw char\n", + " if test==2:\n", + " raise MyException(123.23) #throw double\n", + " except MyException as i:\n", + " if isinstance(i.x,int): #catch an int exception\n", + " print \"Caught\",i.x \n", + " else: #catch all other exceptions\n", + " print \"Caught One!\"\n", + " \n", + "\n", + "print \"start\"\n", + "\n", + "Xhandler(0)\n", + "Xhandler(1)\n", + "Xhandler(2)\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caught 0\n", + "Caught One!\n", + "Caught One!\n", + "end\n" + ] + } + ], + "prompt_number": 8 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.10, Page Number: 407<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "class MyException:\n", + " def __init__(self,s):\n", + " self.x=s\n", + " \n", + "#This function can only throw ints, chars and doubles\n", + "def Xhandler(test):\n", + " if test==0:\n", + " raise MyException(test) #throw int\n", + " if test==1:\n", + " raise MyException('a') #throw char\n", + " if test==2:\n", + " raise MyException(123.23) #throw double\n", + " \n", + "\n", + "print \"start\"\n", + "try:\n", + " Xhandler(0)\n", + "except MyException as i:\n", + " if isinstance(i.x,int): #catch an int exception\n", + " print \"Caught int\" \n", + " elif isinstance(i.x,str): #catch a char exception\n", + " print \"Caught char\"\n", + " elif isinstance(i.x,float): #catch a float exception\n", + " print \"Caught double\"\n", + "\n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caught int\n", + "end\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.11, Page Number: 408<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "def Xhandler():\n", + " try:\n", + " raise Exception(\"hello\") #throw a char *\n", + " except Exception,c: #catch a char *\n", + " print \"Caugh char * inside Xhandler\"\n", + " raise #rethrow char * out of function\n", + " \n", + "print \"start\"\n", + "try:\n", + " Xhandler()\n", + "except Exception,c:\n", + " print \"Caught char * inside main\"\n", + " \n", + "print \"end\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "start\n", + "Caugh char * inside Xhandler\n", + "Caught char * inside main\n", + "end\n" + ] + } + ], + "prompt_number": 10 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.12, Page Number: 410<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "from ctypes import *\n", + "\n", + "#Variable declaration\n", + "p=[]\n", + "\n", + "try:\n", + " for i in range(32):\n", + " p.append(c_int())\n", + "except MemoryError,m:\n", + " print \"Allocation failure.\"\n", + " \n", + "for i in range(32):\n", + " p[i]=i\n", + " \n", + "for i in range(32):\n", + " print p[i],\n", + " \n", + " " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31\n" + ] + } + ], + "prompt_number": 12 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.13, Page Number: 410<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "from ctypes import *\n", + "\n", + "#Variable declaration\n", + "p=[]\n", + "\n", + "\n", + "for i in range(32):\n", + " p.append(c_int()) \n", + "if not(p):\n", + " print \"Allocation failure.\"\n", + " \n", + "for i in range(32):\n", + " p[i]=i\n", + " \n", + "for i in range(32):\n", + " print p[i],\n", + " \n", + " " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "<h3>Example 17.13, Page Number: 412<h3>" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "class three_d:\n", + " def __init__(self,i=0,j=0,k=0): #3=D coordinates\n", + " if(i==0 and j==0 and k==0):\n", + " self.x=self.y=self.z=0\n", + " print \"Constructing 0, 0, 0\"\n", + " else:\n", + " self.x=i\n", + " self.y=j\n", + " self.z=k\n", + " print \"Constructing\",i,\",\",j,\",\",k\n", + " def __del__(self):\n", + " print \"Destructing\"\n", + " #new overloaded relative to three_d.\n", + " def __new__(typ, *args, **kwargs):\n", + " obj = object.__new__(typ, *args, **kwargs)\n", + " return obj\n", + " def show(self):\n", + " print self.x,\",\",\n", + " print self.y,\",\",\n", + " print self.z\n", + " \n", + "p1=[]*3\n", + "p2=[]\n", + " \n", + "try:\n", + " print \"Allocating array of three_d objects.\"\n", + " for i in range(3): #allocate array\n", + " p1.append(three_d())\n", + " print \"Allocating three_d object.\"\n", + " p2.append(three_d(5,6,7)) #allocate object\n", + "except MemoryError:\n", + " print \"Allocation error\"\n", + " \n", + "p1[2].show()\n", + "p2[0].show()\n", + "\n", + "\n", + "for i in xrange(2,-1,-1):\n", + " del p1[i] #delete array\n", + "print \"Deleting array of thee_d objects.\"\n", + "\n", + "del p2[0] #delete object\n", + "print \"Deleting three_d object.\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Allocating array of three_d objects.\n", + "Constructing 0, 0, 0\n", + "Constructing 0, 0, 0\n", + "Constructing 0, 0, 0\n", + "Allocating three_d object.\n", + "Constructing 5 , 6 , 7\n", + "0 , 0 , 0\n", + "5 , 6 , 7\n", + "Destructing\n", + "Destructing\n", + "Destructing\n", + "Deleting array of thee_d objects.\n", + "Destructing\n", + "Deleting three_d object.\n" + ] + } + ], + "prompt_number": 14 + }, + { + "cell_type": "code", + "collapsed": false, + "input": [], + "language": "python", + "metadata": {}, + "outputs": [] + } + ], + "metadata": {} + } + ] +}
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