{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 11: Pointers"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1, Page Number : PTR-5"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"a = int(raw_input(\"\\nEnter two integers : \"))\n",
"b = int(raw_input(\"\"))\n",
"\n",
"xptr = id(a)\n",
"yptr = id(b)\n",
"\n",
"#There is no pointer concept in python\n",
"s = a + b\n",
"\n",
"print \"\\nSum = \",s"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter two integers : 5\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Sum = 8\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2, Page Number : PTR-6"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"a = int(raw_input(\"\\nEnter two integers : \"))\n",
"b = int(raw_input(\"\"))\n",
"\n",
"xptr = id(a)\n",
"yptr = id(b)\n",
"\n",
"#There is no pointer concept in python\n",
"if a > b:\n",
" big = a\n",
"else:\n",
" big = b\n",
" \n",
"print \"\\nBiggest number is \",big"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter two integers : 15\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"25\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Biggest number is 25\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3, Page Number : PTR-7"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def add10(x,y):\n",
" #There is no pointer concept in python\n",
" x = x + 10\n",
" y = y + 10\n",
" print \"\\n\\nInside the function a = \",x,\" b = \",y\n",
" return x,y\n",
" \n",
"a = 25\n",
"b = 10\n",
"\n",
"print \"\\nBefore function call a = \",a,\" b = \",b\n",
"a,b = add10(a,b)\n",
"print \"\\nAfter function call a = \",a,\" b = \",b"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Before function call a = 25 b = 10\n",
"\n",
"\n",
"Inside the function a = 35 b = 20\n",
"\n",
"After function call a = 35 b = 20\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4, Page Number : PTR-11"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def swap(x,y):\n",
" #There is no pointer concept in python\n",
" temp = x\n",
" x = y\n",
" y = temp\n",
" return x,y\n",
"\n",
"a = int(raw_input(\"\\nEnter two integers : \"))\n",
"b = int(raw_input(\"\"))\n",
"\n",
"print \"\\nBefore function call a = \",a,\" b = \",b\n",
"\n",
"a,b = swap(a,b)\n",
"\n",
"print \"\\n\\nAfter function call, values are exchanged as \\n a = \",a,\" b = \",b"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter two integers : 25\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"500\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Before function call a = 25 b = 500\n",
"\n",
"\n",
"After function call, values are exchanged as \n",
" a = 500 b = 25\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5, Page Number : PTR-14"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"\n",
"x = [0.0 for i in range(0,10)]\n",
"n = int(raw_input(\"\\nHow many values ? \"))\n",
"\n",
"print \"\\nEnter all values in the list\\n\"\n",
"\n",
"for i in range(0,n):\n",
" x[i] = float(raw_input(\"\"))\n",
"\n",
"sum1 = 0.0\n",
"#Since sum is a predefined function in python, sum1 is used\n",
"for i in range(0,n):\n",
" sum1 = sum1 + x[i]\n",
" #There is no pointer concept in python\n",
" \n",
"mean = sum1/n\n",
"\n",
"sys.stdout.write(\"\\nArithmetic mean = %0.3f\"%(mean))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"How many values ? 4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter all values in the list\n",
"\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3.48\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3.54\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3.26\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2.98\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Arithmetic mean = 3.315"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6, Page Number : PTR-19"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"\n",
"xp = [0 for i in range(0,10)]\n",
"n = int(raw_input(\"\\nHow many values ? \"))\n",
"\n",
"#There is no pointer concept in python\n",
"print \"\\nEnter all values\\n\"\n",
"\n",
"for i in range(0,n):\n",
" xp[i] = int(raw_input(\"\"))\n",
"\n",
"print \"\\nThe reversed list is\\n\"\n",
"for i in range(n-1,0-1,-1):\n",
" sys.stdout.write(\"%6d\"%(xp[i]))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"How many values ? 6\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter all values\n",
"\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"11\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"12\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"13\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"14\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"15\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"16\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"The reversed list is\n",
"\n",
" 16 15 14 13 12 11"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7, Page Number : PTR-21"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"\n",
"a = [[0 for i in range(0,10)]for i in range(0,10)]\n",
"b = [[0 for i in range(0,10)]for i in range(0,10)]\n",
"\n",
"c = [[0 for i in range(0,5)]for i in range(0,5)]\n",
"m = int(raw_input(\"\\nFor A matrix \\nHow many rows and columns ? \"))\n",
"n = int(raw_input(\"\"))\n",
"\n",
"print \"\\nEnter A matrix values\\n\"\n",
"for i in range(0,m):\n",
" for j in range(0,n):\n",
" a[i][j] = int(raw_input(\"\"))\n",
" \n",
"n = int(raw_input(\"\\nFor B matrix\\nHow many rows and columns ? \"))\n",
"l = int(raw_input(\"\"))\n",
"\n",
"for i in range(0,n):\n",
" for j in range(0,l):\n",
" b[i][j] = int(raw_input(\"\"))\n",
"\n",
"for i in range(0,m):\n",
" for j in range(0,l):\n",
" c[i][j] = 0\n",
" for k in range(0,l):\n",
" c[i][j] = c[i][j] + (a[i][k] * b[k][j])\n",
" \n",
"print \"\\nResultant matrix is \\n\"\n",
"for i in range(0,m):\n",
" for j in range(0,l):\n",
" sys.stdout.write(\"%6d\"%(c[i][j]))\n",
" sys.stdout.write(\"\\n\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"For A matrix \n",
"How many rows and columns ? 3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter A matrix values\n",
"\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"-2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"0\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"-1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"For B matrix\n",
"How many rows and columns ? 3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"6\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"-1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"-5\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Resultant matrix is \n",
"\n",
" 26 9 5\n",
" 4 -28 18\n",
" 18 19 -3\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 8, Page Number : PTR-24"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"count = 0\n",
"\n",
"st = raw_input(\"\\nEnter a string : \")\n",
"sptr = st\n",
"i = 0\n",
"\n",
"while i < len(st):\n",
" if st[i].upper() == 'A' or st[i].upper() == 'E' or st[i].upper() == 'I' or st[i].upper() == 'O' or st[i].upper() == 'U':\n",
" count = count + 1\n",
" i = i + 1\n",
" \n",
"print \"\\nNumber of vowels = \",count"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter a string : GOOD LUCK to all\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Number of vowels = 5\n"
]
}
],
"prompt_number": 32
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9, Page Number : PTR-25"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def sort_names(sn,n):\n",
" for i in range(0,n):\n",
" for j in range(i+1,n):\n",
" if sn[i] > sn[j]:\n",
" temp = sn[i]\n",
" sn[i] = sn[j]\n",
" sn[j] = temp\n",
" \n",
"\n",
"n = int(raw_input(\"\\nHow many names ?\"))\n",
"\n",
"snames = [\"\" for i in range(0,10)]\n",
"\n",
"print \"\\nEnter all names \\n\"\n",
"for i in range(0,n):\n",
" snames[i] = raw_input(\"\")\n",
" \n",
"sort_names(snames,n)\n",
"\n",
"print \"\\nThe name list in alphabetical order\"\n",
"for i in range(0,n):\n",
" print snames[i]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"How many names ?4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter all names \n",
"\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"DEEPAK\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"SHERIN\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"SONIKA\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"ARUN\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"The name list in alphabetical order\n",
"ARUN\n",
"DEEPAK\n",
"SHERIN\n",
"SONIKA\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10, Page Number : PTR-27"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print \"\\nEnter a string : \"\n",
"st = raw_input(\"\")\n",
"rst = ['' for i in range(0,80)]\n",
"\n",
"rst = st[::-1]\n",
" \n",
"if st == rst:\n",
" print st,\" is a palindrome string\"\n",
"else:\n",
" print st,\" is not a palindrome string\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter a string : \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"LIRIL\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"LIRIL is a palindrome string\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11, Page Number : PTR-28"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print \"\\nEnter a string : \"\n",
"st = raw_input(\"\")\n",
"\n",
"#There is no pointer concept in python\n",
"city = st\n",
"\n",
"print \"\\nThe copied string : \",city"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter a string : \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"NEW DELHI\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"The copied string : NEW DELHI\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12, Page Number : PTR-30"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#class is used instead of structure in python\n",
"\n",
"class student():\n",
" rno = 0\n",
" sname = ''\n",
" tot = 0\n",
"\n",
"sptr = student()\n",
"sptr.rno = int(raw_input(\"\\nEnter register No.:\"))\n",
"sptr.sname = raw_input(\"\\nEnter student name : \")\n",
"sptr.tot = int(raw_input(\"\\nEnter total marks : \"))\n",
"\n",
"print \"\\n\\tDetails entered are \\n\"\n",
"print \"\\nReg.No, : \",sptr.rno\n",
"print \"\\nName : \",sptr.sname\n",
"print \"\\nTotal : \",sptr.tot\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter register No.:101\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter student name : Ashwin\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter total marks : 89\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"\tDetails entered are \n",
"\n",
"\n",
"Reg.No, : 101\n",
"\n",
"Name : Ashwin\n",
"\n",
"Total : 89\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 13, Page Number : PTR-32"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#There is no pointer concept in python\n",
"def add(x,y):\n",
" return x+y\n",
"\n",
"def multiply(x,y):\n",
" return x*y\n",
"\n",
"a = int(raw_input(\"\\nEnter two integers : \"))\n",
"b = int(raw_input(\"\"))\n",
"\n",
"sum1 = add(a,b)\n",
"\n",
"print \"Sum a + b = \",sum1\n",
"\n",
"product = multiply(a,b)\n",
"print \"\\nProduct a * b = \",product"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Enter two integers : 5\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Sum a + b = 8\n",
"\n",
"Product a * b = 15\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
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}
],
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}
]
}