{
"metadata": {
"name": "",
"signature": "sha256:afd37f358b4faba0dd82fd8fdf176be8389b2a27c7cdec9882b3da534d4a3ec8"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4: Control Structures"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example if1.c, page no. 101"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"i = int(raw_input(\"Enter a number: \")) \n",
"if i % 3 == 0 :\n",
" print \"Number entered is divisible by 3.\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a number: 30\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Number entered is divisible by 3.\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example scanf8.c, page no. 102"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#The output in the textbok is 0.000000 because it was not able to convert string to float in C\n",
"#Hence, by default it stored 0.0000000. In Python the same would give error. Hence, the answer differs\n",
"\n",
"years = float(raw_input(\"Input your age in years: \"))\n",
"secs = years * 365 * 24 * 60 * 60\n",
"print \"You have livid for %f seconds \" %secs"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input your age in years: 25\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"You have livid for 788400000.000000 seconds \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example if2.c, page no. 102"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#the way it is given in textbook is not possible in Python. Doing it in different manner\n",
"\n",
"print \"Input your age in years: \",\n",
"years =(raw_input())\n",
"try:\n",
" float(years)\n",
" secs = float(years) * 365 * 24 * 60 * 60\n",
" print \"you have lived for %f seconds\" %secs\n",
"except:\n",
" print \"the input is not a floating-point number\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input your age in years: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"75\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" you have lived for 2365200000.000000 seconds\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example if3.c, page no. 103"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#the program will remain same as the previous one\n",
"\n",
"print \"Input your age in years: \",\n",
"years =(raw_input())\n",
"try:\n",
" float(years)\n",
" secs = float(years) * 365 * 24 * 60 * 60\n",
" print \"you have lived for %f seconds\" %secs\n",
"except:\n",
" print \"the input is not a floating-point number\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input your age in years: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"sundeep\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" the input is not a floating-point number\n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example large.c, page no. 105"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print \"Input a b c\"\n",
"a = float(raw_input(\"a=\"))\n",
"b = float(raw_input(\"b=\"))\n",
"c = float(raw_input(\"c=\"))\n",
"big = a\n",
"if b>big :\n",
" big = b\n",
"if c>big :\n",
" big = c\n",
"print \"Largest of the three numbers = %7.2f\" %big"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input a b c\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"a=10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"b=20\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"c=45\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Largest of the three numbers = 45.00\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example ifelse1.c, page no. 105"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#the program will remain same as the previous one\n",
"\n",
"print \"Input your age in years: \",\n",
"years =(raw_input())\n",
"try:\n",
" float(years)\n",
" secs = float(years) * 365 * 24 * 60 * 60\n",
" print \"you have lived for %f seconds\" %secs\n",
"except:\n",
" print \"the input is not a floating-point number\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input your age in years: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"100\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" you have lived for 3153600000.000000 seconds\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example ifelse2.c, page no. 107"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"input1 = int(raw_input(\"Input an integer: \"))\n",
"if input1 :\n",
" print \"It is non-zero.\"\n",
"else :\n",
" print \"it is zero.\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input an integer: 12\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"It is non-zero.\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example scope.c, page no. 112"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#The block given in the textbook is not possible in Python. Here the value will remain the same.\n",
"\n",
"i = 10\n",
"print \"In main. i is %d \" %i\n",
"i = 20\n",
"print \"In compound statement. i is %d\" %i\n",
"i = i+1\n",
"print \"After incrementing: i is %d\" %i\n",
"print \"In main again. i is %d\" %i"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"In main. i is 10 \n",
"In compound statement. i is 20\n",
"After incrementing: i is 21\n",
"In main again. i is 21\n"
]
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example for.c, page no. 113"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"for i in range(1, 11):\n",
" print i*5,"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"5 10 15 20 25 30 35 40 45 50\n"
]
}
],
"prompt_number": 26
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example sumsq1.c, page no. 115"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"sum = 0\n",
"sum_of_squares = 0\n",
"for i in range(2, 31, 2):\n",
" sum += i\n",
" sum_of_squares += i*i\n",
"print \"Sum of first 15 positive even numbers = \", sum\n",
"print \"Sum of their squares = \", sum_of_squares"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Sum of first 15 positive even numbers = 240\n",
"Sum of their squares = 4960\n"
]
}
],
"prompt_number": 27
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example sumsq2.c, page no. 116"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"sum = 0\n",
"sum_of_squares = 0\n",
"for i in range(30, 1, -2):\n",
" sum += i\n",
" sum_of_squares += i*i\n",
"print \"Sum of first 15 positive even numbers = \", sum\n",
"print \"Sum of their squares = \", sum_of_squares"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Sum of first 15 positive even numbers = 240\n",
"Sum of their squares = 4960\n"
]
}
],
"prompt_number": 29
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example for2.c, page no. 116"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"for i in range(1, 11):\n",
" print 5*i,"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"5 10 15 20 25 30 35 40 45 50\n"
]
}
],
"prompt_number": 30
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.1, page no. 117"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#error in textbook, i should be initialized by 1\n",
"\n",
"sign = 1\n",
"print \"Input X and N: \"\n",
"x = float(raw_input(\"X: \"))\n",
"n = int(raw_input(\"N: \"))\n",
"x *= 3.1412/180.0\n",
"sum, t = x, x\n",
"for i in range(1, n):\n",
" sign *=-1\n",
" t = sign * x * x / (2*i*(2*i+1))\n",
" sum += t\n",
"print \"SIN(X) = %6.2f\" %sum"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input X and N: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"X: 60\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"N: 12\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"SIN(X) = 0.90\n"
]
}
],
"prompt_number": 33
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.2, page no. 118"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"num = 0\n",
"sum = 0\n",
"print \"Input the marks, -1 at the end\"\n",
"i = int(raw_input())\n",
"while i != -1:\n",
" sum += i\n",
" num += 1\n",
" i = int(raw_input())\n",
"average = sum / num\n",
"print \"The average is %.2f\" %average"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input the marks, -1 at the end\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"12\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"14\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"16\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"18\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"-1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The average is 15.00\n"
]
}
],
"prompt_number": 34
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example binary.c, page no. 120"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"binary = raw_input(\"Input the binary number: \")\n",
"decimal = int(binary, 2)\n",
"print \"The decimal equivalent of binary number %s is %d\" %(binary, decimal)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input the binary number: 1101\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The decimal equivalent of binary number 1101 is 13\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example dowhile.c, page no. 122"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#there is no do while loop in Python. We will use simple while loop\n",
"inchar = ''\n",
"while(inchar != 'y' and inchar != 'n'):\n",
" inchar = raw_input(\"Input y or n: \")\n",
"if inchar == 'y':\n",
" print \"you pressed y.\"\n",
"if inchar == 'n':\n",
" print \"you pressed n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input y or n: j\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input y or n: j\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input y or n: n\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"you pressed n\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.4, page no. 123"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"num = int(raw_input(\"Input the number: \"))\n",
"n = num\n",
"sum = 0\n",
"rev = 0\n",
"while(num != 0):\n",
" digit = num % 10\n",
" sum += digit\n",
" rev = rev * 10 + digit\n",
" num /= 10\n",
"print \"Sum of the digits of the number = %4d\" %sum\n",
"print \"Reverse of the number = %7d\" %rev\n",
"if n == rev:\n",
" print \"The number is a palindrome\"\n",
"else:\n",
" print \"The number is not a palindrome\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input the number: 1221\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Sum of the digits of the number = 6\n",
"Reverse of the number = 1221\n",
"The number is a palindrome\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example iflese.c, page no. 127"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"print \"Choice of destinations: \"\n",
"print \"\\t1 - Mercury\"\n",
"print \"\\t2 - Venus\"\n",
"print \"\\t3 - Mars\"\n",
"choice = int(raw_input(\"Enter the number corresponding to your choice: \"))\n",
"if choice == 1:\n",
" print \"Mercury is closest to the sun.\"\n",
" print \"So the weather may be quite hot there.\"\n",
" print \"The journey will cost you 5200 IGCs.\"\n",
"elif choice == 2:\n",
" print \"Venus is the second planet from the sun.\"\n",
" print \"The weather may be hot and poisonous.\"\n",
" print \"The journey will cost you 3200 IGCs.\"\n",
"elif choice == 3:\n",
" print \"Mars is the closest planet to the earth.\"\n",
" print \"The weather has been excellent till now.\"\n",
" print \"The journey will cost you 1200 IGCs.\"\n",
"else:\n",
" \"Unknown destination. Unpredictable IGCs\"\n",
"print \"Note: IGC = Ingeer-Galactic Currency\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Choice of destinations: \n",
"\t1 - Mercury\n",
"\t2 - Venus\n",
"\t3 - Mars\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the number corresponding to your choice: 2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Venus is the second planet from the sun.\n",
"The weather may be hot and poisonous.\n",
"The journey will cost you 3200 IGCs.\n",
"Note: IGC = Ingeer-Galactic Currency\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.5, page no. 128"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#there is no switch case in Python, hence, no use of break in if conditions. So, the program will remain same\n",
"\n",
"print \"Choice of destinations: \"\n",
"print \"\\t1 - Mercury\"\n",
"print \"\\t2 - Venus\"\n",
"print \"\\t3 - Mars\"\n",
"choice = int(raw_input(\"Enter the number corresponding to your choice: \"))\n",
"if choice == 1:\n",
" print \"Mercury is closest to the sun.\"\n",
" print \"So the weather may be quite hot there.\"\n",
" print \"The journey will cost you 5200 IGCs.\"\n",
"elif choice == 2:\n",
" print \"Venus is the second planet from the sun.\"\n",
" print \"The weather may be hot and poisonous.\"\n",
" print \"The journey will cost you 3200 IGCs.\"\n",
"elif choice == 3:\n",
" print \"Mars is the closest planet to the earth.\"\n",
" print \"The weather has been excellent till now.\"\n",
" print \"The journey will cost you 1200 IGCs.\"\n",
"else:\n",
" \"Unknown destination. Unpredictable IGCs\"\n",
"print \"Note: IGC = Ingeer-Galactic Currency\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Choice of destinations: \n",
"\t1 - Mercury\n",
"\t2 - Venus\n",
"\t3 - Mars\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the number corresponding to your choice: 3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Mars is the closest planet to the earth.\n",
"The weather has been excellent till now.\n",
"The journey will cost you 1200 IGCs.\n",
"Note: IGC = Ingeer-Galactic Currency\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.6, page no. 130"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print \"Input a b & c\"\n",
"a = float(raw_input(\"a: \"))\n",
"b = float(raw_input(\"b: \"))\n",
"c = float(raw_input(\"c: \"))\n",
"if a != 0:\n",
" disc = b * b - 4 * a * c\n",
" print \"Discriminant = %5.2f\" %disc\n",
" if disc < 0:\n",
" k = 1\n",
" elif disc == 0:\n",
" k = 2\n",
" elif disc > 0:\n",
" k = 3\n",
" if k == 1:\n",
" print \"Roots are imaginary\"\n",
" real = -b/(2*a)\n",
" disc = -disc\n",
" num = pow(disc, 0.5)\n",
" imag = num/(2*a)\n",
" print \"Root1 = %5.2f +j %5.2f\" %(real, imag)\n",
" print \"Root2 = %5.2f -j %5.2f\" %(real, imag)\n",
" elif k == 2:\n",
" print \"Roots are real equal\"\n",
" root1 = -b/(2*a)\n",
" print \"Root1 = Root2 = %7.2f\" %root1\n",
" elif k == 3:\n",
" print \"Roots are real and unequal\"\n",
" root1 = (-b + sqrt(disc))/(2*a)\n",
" root2 = (-b - sqrt(disc))/(2*a)\n",
" print \"Root1 = %7.2f Root2 = %7.2f\" %(root1, root2)\n",
"else:\n",
" print \"Equation is linear\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input a b & c\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"a: 1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"b: 2\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"c: 7\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Discriminant = -24.00\n",
"Roots are imaginary\n",
"Root1 = -1.00 +j 2.45\n",
"Root2 = -1.00 -j 2.45\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.7, page no. 132"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"sum = 0\n",
"for i in range(5):\n",
" num = int(raw_input(\"Enter an integer: \"))\n",
" if num < 0:\n",
" print \"You have entered a negative number\"\n",
" continue\n",
" sum += num\n",
"print \"The sum of positive integers entered = \", sum"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter an integer: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter an integer: -15\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"You have entered a negative number\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter an integer: 15\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter an integer: -100\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"You have entered a negative number\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter an integer: 30\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The sum of positive integers entered = 55\n"
]
}
],
"prompt_number": 28
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.8, page no. 133"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print \"Input X & N\"\n",
"x = float(raw_input(\"X: \"))\n",
"n = int(raw_input(\"N: \"))\n",
"t = 1\n",
"sum = 1\n",
"for i in range(1, n):\n",
" ifact = i\n",
" t = t*x/ifact\n",
" sum +=t\n",
"print \"E raies to power x = %10.4f\" %sum"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Input X & N\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"X: 1.00\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"N: 2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"E raies to power x = 2.0000\n"
]
}
],
"prompt_number": 31
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.9, page no. 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"n = int(raw_input(\"Enter the number: \"))\n",
"if n == 0:\n",
" print \"The factorial of 0 is 1\"\n",
"else:\n",
" fact = 1\n",
" for i in range(1, n+1):\n",
" fact = fact * i\n",
" print \"Factorial of %4d is %5d\" %(n, fact)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the number: 5\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Factorial of 5 is 120\n"
]
}
],
"prompt_number": 33
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.10, page no. 135"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"binom = 1\n",
"q = 0\n",
"p = int(raw_input(\"Input the number of rows: \"))\n",
"print \"Pascal Triangle\"\n",
"while q < p:\n",
" for r in range(40-3*q, 0, -1):\n",
" print \" \",\n",
" for x in range(0, q+1):\n",
" if x == 0 or q == 0:\n",
" binom = 1\n",
" else:\n",
" binom = (binom*(q-x+1))/x\n",
" print \"%6d\" %binom,\n",
" print \"\\n\"\n",
" q+=1"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input the number of rows: 9\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Pascal Triangle\n",
" 1 \n",
"\n",
" 1 1 \n",
"\n",
" 1 2 1 \n",
"\n",
" 1 3 3 1 \n",
"\n",
" 1 4 6 4 1 \n",
"\n",
" 1 5 10 10 5 1 \n",
"\n",
" 1 6 15 20 15 6 1 \n",
"\n",
" 1 7 21 35 35 21 7 1 \n",
"\n",
" 1 8 28 56 70 56 28 8 1 \n",
"\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.11, page no. 136"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"print \"Enter 1 for triangle(3 sides) & 2 for triangle(base, ht): \",\n",
"k = int(raw_input())\n",
"if k == 1:\n",
" print \"Enter 3 sides - a,b and c\"\n",
" a = float(raw_input(\"a: \"))\n",
" b = float(raw_input(\"b: \"))\n",
" c = float(raw_input(\"c: \"))\n",
" p = a + b + c\n",
" s = (a + b + c)/2\n",
" area = math.sqrt(s*(s-a)*(s-b)*(s-c))\n",
" print \"Perimeter = %6.2f\" %p\n",
" print \"Area of triangle = %7.2f\" %area\n",
"elif k == 2:\n",
" print \"Enter height and base\"\n",
" height = float(raw_input(\"height: \"))\n",
" base = float(raw_input(\"base: \"))\n",
" area = (base*height)/2\n",
" print \"Area of triangle = %7.2f\" %area"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter 1 for triangle(3 sides) & 2 for triangle(base, ht): "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter 3 sides - a,b and c\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"a: 4.55\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"b: 5.00\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"c: 6.00\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Perimeter = 15.55\n",
"Area of triangle = 11.11\n"
]
}
],
"prompt_number": 47
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.12, page no. 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"print \"Enter the no of lines in the pyramid: \"\n",
"t = int(raw_input())\n",
"print \"\\t\\tREVERSED PYRAMID OF DIGITS\"\n",
"k = 0\n",
"for p in range(t, 0, -1):\n",
" k += 1\n",
" sys.stdout.write (\" \")\n",
" for r in range(0, (k*4)+1):\n",
" sys.stdout.write (\" \")\n",
" for q in range(p, (2*p)-1): \n",
" sys.stdout.write (\"%4d\" %q)\n",
" for s in range((2*p)-2, p-1, -1):\n",
" sys.stdout.write(\"%4d\\b\" %s)\n",
" sys.stdout.write (\"\\n\")\n",
"print \" %d\" %p\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the no of lines in the pyramid: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"7\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\t\tREVERSED PYRAMID OF DIGITS\n",
" 7 8 9 10 11 12 12\b 11\b 10\b 9\b 8\b 7\b\n",
" 6 7 8 9 10 10\b 9\b 8\b 7\b 6\b\n",
" 5 6 7 8 8\b 7\b 6\b 5\b\n",
" 4 5 6 6\b 5\b 4\b\n",
" 3 4 4\b 3\b\n",
" 2 2\b\n",
" \n",
" 1\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.13, page no. 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"n = 20\n",
"x = float(raw_input(\"Input x: \"))\n",
"x = x*3.1412/180\n",
"t = 1\n",
"sum = 1\n",
"for i in range(1, n+1):\n",
" t = t*pow(-1, (2*i-1))*x*x/(2*i*(2*i-1))\n",
" sum += t\n",
"print \"COS(X) = %7.3f\" %sum"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Input x: 90.00\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"COS(X) = 0.000\n"
]
}
],
"prompt_number": 62
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.14, page no. 138"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"n = int(raw_input(\"Enter the number of lines: \"))\n",
"for p in range(1, n+1):\n",
" for i in range(1, n-p):\n",
" print \" \",\n",
" m = p\n",
" for q in range(1, p+1):\n",
" print \"%4d\" %m,\n",
" m +=1\n",
" m = m - 2\n",
" for q in range(1, p):\n",
" print \"%4d\" %m,\n",
" m-=1\n",
" print \"\\n\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the number of lines: 7\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" 1 \n",
"\n",
"\n",
" 2 3 2 \n",
"\n",
"\n",
" 3 4 5 4 3 \n",
"\n",
"\n",
" 4 5 6 7 6 5 4 \n",
"\n",
"\n",
" 5 6 7 8 9 8 7 6 5 \n",
"\n",
"\n",
" 6 7 8 9 10 11 10 9 8 7 6 \n",
"\n",
"\n",
" 7 8 9 10 11 12 13 12 11 10 9 8 7 \n",
"\n",
"\n"
]
}
],
"prompt_number": 67
}
],
"metadata": {}
}
]
}