Index

A

• advanced C#, problems
  • about / Problems
  • LINQ style / 73. Directory size, LINQ style
  • directory size / 73. Directory size, LINQ style, 74. Directory size, PLINQ style
  • PLINQ style / 74. Directory size, PLINQ style
  • DirectoryInfo class / 75. Find files, LINQ style
  • parallel primes table / 76. Parallel primes table
  • parallel prime tuples / 77. Parallel prime tuples
  • parallel Monte Carlo π / 78. Parallel Monte Carlo π
  • primes, yielding / 79. Yielding primes
  • Fibonacci numbers, yielding / 80. Yielding Fibonacci numbers
  • complex numbers / 81. Complex numbers
• advanced C#, solutions
  • about / Solutions
  • directory size / 73. Directory size, LINQ style, 74. Directory size, PLINQ style
  • LINQ style / 73. Directory size, LINQ style, 75. Find files, LINQ style
  • PLINQ style / 74. Directory size, PLINQ style
  • DirectoryInfo class / 75. Find files, LINQ style
  • parallel primes table / 76. Parallel primes table
  • parallel primes tuple / 77. Parallel primes tuple
  • parallel Monte Carlo π / 78. Parallel Monte Carlo π
  • primes, yielding / 79. Yielding primes
  • Fibonacci numbers, yielding / 80. Yielding Fibonacci numbers
  • complex numbers / 81. Complex numbers
• age
  • calculating / 48. Calculating age, 48. Calculating age
• amicable numbers / 17. Amicable numbers, 17. Amicable numbers
• argument / 81. Complex numbers
• Armstrong number / 19. Armstrong numbers, 19. Armstrong numbers
• arrowheads / 28. Arrowheads, 28. Arrowheads
• augmented matrix / 24. Gaussian elimination

B

• backsolving / 24. Gaussian elimination
• bases / 27. Trapezoid rule integration
• Binomial coefficients
  • about / 6. Binomial coefficients
  • calculating / 6. Binomial coefficients
• bisection root-finding / 22. Bisection root-finding
• bytes
  • to hex / 57. Bytes to hex, 57. Bytes to hex

C

• Caesar cipher / 91. Caesar cipher, 91. Caesar cipher
• circle-circle intersection / 35. Circle-circle intersection, 35. Circle-circle intersection
• circle-line tangents / 36. Circle-line tangents, 36. Circle-line tangents
• circle selection / 33. Circle selection, 33. Circle selection
• coder decoder (codec) / 72. Compressing images
• Collatz conjecture / 83. Hailstone sequence
• combinations / 3. Combinations, 3. Combinations
• composite numbers / 11. Primality testing
• convexity testing / 39. Convexity testing, 39. Convexity testing
• convex polygon / 39. Convexity testing
• cousin primes / 15. Prime tuples
• cross product / 38. Point in a polygon
• Cryptographically Secure Pseudorandom Number Generator (CSPRNG) / 93. Cryptographic pseudorandom numbers
• Cryptographic Pseudorandom Number Generator (CPRNG) / 93. Cryptographic pseudorandom numbers, 93. Cryptographic random numbers
• cryptography, problems
  • Caesar cipher / 91. Caesar cipher
  • Vigenère cipher / 92. Vigenère cipher
  • cryptographic pseudorandom numbers / 93. Cryptographic pseudorandom numbers
  • primality testing / 94. Primality testing, redux
  • primes, searching / 95. Find primes
  • hash files / 96. Hash files
  • steganography / 97. Steganography
  • strings, encrypting / 98. Encrypt and decrypt strings
  • strings, decrypting / 98. Encrypt and decrypt strings
  • files, encrypting / 99. Encrypt and decrypt files
  • files, decrypting / 99. Encrypt and decrypt files
  • CryptoPad / 100. CryptoPad
• cryptography, solutions
  • about / Solutions
  • Caesar cipher / 91. Caesar cipher
  • Vigenère cipher / 92. Vigenère cipher
  • cryptographic random numbers / 93. Cryptographic random numbers
  • primality testing / 94. Primality testing, redux
  • primes, searching / 95. Find primes
  • hash files / 96. Hash files
  • steganography / 97. Steganography
  • strings, encrypting / 98. Encrypt and decrypt strings
  • strings, decrypting / 98. Encrypt and decrypt strings
  • files, decrypting / 99. Encrypt and decrypt files
  • files, encrypting / 99. Encrypt and decrypt files
  • CryptoPad / 100. CryptoPad
• CryptoPad / 100. CryptoPad, 100. CryptoPad

D

• DateTimePicker control / 42. Date and time picker, 42. Date and time picker
• Dawkins' weasel / 82. Dawkins' weasel
• discriminant / 34. Line-circle intersection
• divisor / 16. Proper divisors
• dot product / 38. Point in a polygon
• duration
  • calculating / 47. Calculating duration, 47. Calculating duration

E

• edit distance / 61. Edit distance, 61. Edit distance
• Euclid's algorithm / 8. Greatest common divisors

F

• factorials
  • about / 4. Factorials
  • calculating / 4. Factorials
• Fibonacci numbers
  • calculating / 5. Fibonacci numbers, 5. Fibonacci numbers
• files
  • encrypting / 99. Encrypt and decrypt files, 99. Encrypt and decrypt files
  • decrypting / 99. Encrypt and decrypt files, 99. Encrypt and decrypt files
• files, problems
  • about / Problems
  • blank lines, removing / 64. Removing blank lines
  • directory size / 65. Directory size
  • duplicate files, finding / 66. Finding duplicate files
  • thumbnails / 67. Thumbnails
  • thumbnails web page / 68. Thumbnail web page
  • directory, searching / 69. Find files
  • Find and Replace / 70. Find and Replace
  • images, saving / 71. Saving images
  • images, compressing / 72. Compressing images
• files, solution
  • about / Solutions
  • blank lines, removing / 64. Removing blank lines
  • directory size / 65. Directory size
  • duplicate files, finding / 66. Finding duplicate files
  • thumbnails / 67. Thumbnails
  • thumbnails web page / 68. Thumbnail web page
  • directory, searching / 69. Find files
  • Find and Replace / 70. Find and Replace
  • images, saving / 71. Saving images
  • images, compressing / 72. Compressing images

G

• Game of Life / 86. Life, 86. Life
• Gaussian elimination / 24. Gaussian elimination, 24. Gaussian elimination
• geometry, problems
  • about / Problems
  • Monte Carlo π / 20. Monte Carlo π
  • Newton's π / 21. Newton's π
  • bisection root-finding / 22. Bisection root-finding
  • Newton's method / 23. Newton's method
  • Gaussian elimination / 24. Gaussian elimination
  • Monte Carlo integration / 25. Monte Carlo integration
  • rectangle rule integration / 26. Rectangle rule integration
  • trapezoid rule integration / 27. Trapezoid rule integration
  • arrowheads / 28. Arrowheads
  • line-line intersection / 29. Line-line intersection
  • point-line distance / 30. Point-line distance
  • point-segment distance / 31. Point-segment distance
  • segment-segment distance / 32. Segment-segment distance
  • circle selection / 33. Circle selection
  • line-circle intersection / 34. Line-circle intersection
  • circle-circle intersection / 35. Circle-circle intersection
  • circle-line tangents / 36. Circle-line tangents
  • polygon area / 37. Polygon area
  • point in polygon / 38. Point in a polygon
  • convexity testing / 39. Convexity testing
  • stars / 40. Stars
• geometry, solutions
  • about / Solutions
  • Monte Carlo π / 20. Monte Carlo π
  • Newton's π / 21. Newton's π
  • bisection root-finding / 22. Bisection root-finding
  • Newton's method / 23. Newton's method
  • Gaussian elimination / 24. Gaussian elimination
  • Monte Carlo integration / 25. Monte Carlo integration
  • rectangle rule integration / 26. Rectangle rule integration
  • trapezoid rule integration / 27. Trapezoid rule integration
  • arrowheads / 28. Arrowheads
  • line-line intersection / 29. Line-line intersection
  • point-line distance / 30. Point-line distance
  • point-segment distance / 31. Point-segment distance
  • segment-segment distance / 32. Segment-segment distance
  • circle selection / 33. Circle selection
  • line-circle intersection / 34. Line-circle intersection
  • circle-circle intersection / 35. Circle-circle intersection
  • circle-line tangents / 36. Circle-line tangents
  • polygon area / 37. Polygon area
  • point in polygon / 38. Point in a polygon
  • convexity testing / 39. Convexity testing
  • Stars / 40. Stars
• greatest common divisors (GCD) / 8. Greatest common divisors, 8. Greatest common divisors

H

• Hailstone sequence / 83. Hailstone sequence, 83. Hailstone sequence
• hashing / 96. Hash files, 96. Hash files

I

• immutable / 81. Complex numbers
• infinite monkey theorem / 82. Dawkins' weasel
• initialization vector (IV) / 98. Encrypt and decrypt strings
• integration / 25. Monte Carlo integration

L

• Langton's Ant / 85. Langton's Ant, 85. Langton's Ant
• least common multiple (LCM) / 9. Least common multiples, 9. Least common multiples
• legs / 27. Trapezoid rule integration
• line-circle intersection / 34. Line-circle intersection, 34. Line-circle intersection
• line-line intersection / 29. Line-line intersection, 29. Line-line intersection
• local time zone clocks / 46. Local time zone clocks, 46. Local time zone clocks
• lock object / 77. Parallel primes tuple
• longest common substring / 63. Longest common substring

M

• match points / 61. Edit distance
• mathematics, problems
  • about / Problems
  • statistical functions /
  • permutations / 2. Permutations
  • combinations / 3. Combinations
  • factorials / 4. Factorials
  • fibonacci numbers / 5. Fibonacci numbers
  • binomial coefficient / 6. Binomial coefficients
  • Pascal's triangle / 7. Pascal's triangle
  • greatest common divisor / 8. Greatest common divisors
  • least common multiple / 9. Least common multiples
  • sum of multiples / 10. Sums of multiples
  • primality testing / 11. Primality testing
  • prime table / 12. Prime table
  • prime factors / 13. Prime factors
  • unique prime factors / 14. Unique prime factors
  • prime tuples / 15. Prime tuples
  • proper divisors / 16. Proper divisors
  • amicable numbers / 17. Amicable numbers
  • perfect number / 18. Perfect numbers
  • Armstrong number / 19. Armstrong numbers
• mathematics, solutions
  • about / Solutions
  • statistical functions / 1. Statistical functions
  • permutations / 2. Permutations
  • combinations / 3. Combinations
  • factorials, calculating / 4. Factorials
  • Fibonacci numbers, calculating / 5. Fibonacci numbers
  • Binomial coefficients, calculating / 6. Binomial coefficients
  • Pascal's triangle / 7. Pascal's triangle
  • greatest common divisors (GCD) / 8. Greatest common divisors
  • least common multiples / 9. Least common multiples
  • sum of multiples / 10. Sums of multiples
  • sums of multiples / 10. Sums of multiples
  • primality testing / 11. Primality testing
  • prime table / 12. Prime table
  • prime factors / 13. Prime factors
  • unique prime factors / 14. Unique prime factors
  • prime tuples / 15. Prime tuples
  • proper divisors / 16. Proper divisors
  • amicable numbers / 17. Amicable numbers
  • perfect numbers / 18. Perfect numbers
  • Armstrong numbers / 19. Armstrong numbers
• meetings
  • scheduling / 44. Scheduling meetings, 44. Scheduling meetings
• midpoint rule / 26. Rectangle rule integration
• modulus / 81. Complex numbers
• Monte Carlo algorithm / 20. Monte Carlo π, 20. Monte Carlo π
• Monte Carlo integration / 25. Monte Carlo integration, 25. Monte Carlo integration
• Multipurpose Internet Mail Extensions (MIME) / 72. Compressing images

N

• Newton's method / 21. Newton's π, 23. Newton's method
• Newton-Raphson method / 23. Newton's method
• norm / 81. Complex numbers
• Not a Number (NaN) / 21. Newton's π

P

• palindromic substrings / 59. Palindromic substrings, 59. Palindromic substrings
• parametric equation / 29. Line-line intersection
• Pascal's triangle / 7. Pascal's triangle, 7. Pascal's triangle
• passwords
  • validating / 60. Validating passwords, 60. Validating passwords
• perfect number / 18. Perfect numbers, 18. Perfect numbers
• permutations / 2. Permutations, 2. Permutations
• perpendicular / 28. Arrowheads
• phase / 81. Complex numbers
• point-line distance / 30. Point-line distance, 30. Point-line distance
• point-segment distance / 31. Point-segment distance, 31. Point-segment distance
• point in polygon / 38. Point in a polygon
• polygon area / 37. Polygon area, 37. Polygon area
• primality testing / 11. Primality testing, 94. Primality testing, redux, 94. Primality testing, redux
• prime factors / 13. Prime factors, 13. Prime factors
• prime number / 11. Primality testing
• prime table / 12. Prime table
• prime tuples / 15. Prime tuples
• problems, dates and times
  • about / Problems
  • week days, displaying / 41. Days of the week
  • DateTimePicker control / 42. Date and time picker
  • time zone chart / 43. Time zone chart
  • meetings, scheduling / 44. Scheduling meetings
  • time zone clocks / 45. Time zone clocks
  • local time zone clocks / 46. Local time zone clocks
  • duration, calculating / 47. Calculating duration
  • age, calculating / 48. Calculating age
• proper divisors / 16. Proper divisors, 16. Proper divisors
• pseudorandom techniques / 93. Cryptographic pseudorandom numbers
• punctuation
  • removing / 58. Removing punctuation, 58. Removing punctuation

R

• race condition / 76. Parallel primes table
• randomization, problems
  • about / Problems
  • random doubles / 49. Random doubles
  • random items / 50. Random items
  • Randomize extension / 51. Randomize items
  • ChooseGroup extension methods / 52. Random groups
  • items, selecting with probabilities / 53. Choose items with probabilities
  • random passwords / 54. Random passwords
  • random walks / 55. Random walks
• randomization, solutions
  • random doubles / 49. Random doubles
  • random items / 50. Random items
  • items, randomizing / 51. Randomize items
  • random groups / 52. Random groups
  • items, selecting with probabilities / 53. Choose items with probabilities
  • random passwords / 54. Random passwords
  • random walks / 55. Random walks
• rectangle rule / 26. Rectangle rule integration
• rectangle rule integration / 26. Rectangle rule integration
• Riemann sum / 26. Rectangle rule integration
• Roman numerals / 56. Roman numerals, 56. Roman numerals
• root-finding algorithms / 22. Bisection root-finding
• row operation / 24. Gaussian elimination

S

• segment-segment distance / 32. Segment-segment distance, 32. Segment-segment distance
• sexy primes / 15. Prime tuples
• Sharks and Fish / 87. Sharks and Fish, 87. Sharks and Fish
• simulations, problems
  • about / Problems
  • Dawkins' weasel / 82. Dawkins' weasel
  • Hailstone sequence / 83. Hailstone sequence
  • hailstone sequence, visualizing / 84. Hailstone sequence, Redux
  • Langton's Ant / 85. Langton's Ant
  • Life / 86. Life
  • Sharks and Fish / 87. Sharks and Fish
  • slingshot / 88. Slingshot
  • Slingshot refinements / 89. Slingshot refinements
  • Space Force / 90. Space Force
• simulations, solutions
  • about / Solutions
  • Dawkins' weasel / 82. Dawkins' weasel
  • Hailstone sequence / 83. Hailstone sequence
  • hailstone sequence, visualizing / 84. Hailstone Sequence, Redux
  • Langton's Ant / 85. Langton's Ant
  • Life / 86. Life
  • Sharks and Fish / 87. Sharks and Fish
  • Slingshot / 88. Slingshot
  • Slingshot refinements / 89. Slingshot refinements
  • Space Force / 90. Space Force
• Slingshot
  • about / 88. Slingshot, 88. Slingshot
  • refinements / 89. Slingshot refinements, 89. Slingshot refinements
  • projectile motion / Projectile motion
  • example solution / Example solution
• solutions, dates and times
  • about / Solutions
  • MonthCalendar control / 41. Days of the week
  • DateTimePicker control / 42. Date and time picker
  • time zone chart / 43. Time zone chart
  • meetings, scheduling / 44. Scheduling meetings
  • time zone clocks / 45. Time zone clocks
  • local time zone clocks / 46. Local time zone clocks
  • duration, calculating / 47. Calculating duration
  • age, calculating / 48. Calculating age
• Soundex algorithm / 62. Soundex
• Space Force
  • about / 90. Space Force, 90. Space Force, Other details
  • Sprite classes / Sprite classes
  • Bubble / Bubble
  • Ship class / Ship
  • Keyboard events / Keyboard events
• Stars / 40. Stars
• statistical functions
  • about / 1. Statistical functions
  • truncated mean /
  • median /
  • mode /
  • sample standard deviation /
  • population standard deviation /
• steganography / 97. Steganography, 97. Steganography
• strings
  • encrypting / 98. Encrypt and decrypt strings, 98. Encrypt and decrypt strings
  • decrypting / 98. Encrypt and decrypt strings, 98. Encrypt and decrypt strings
• strings, problems
  • Roman numerals / 56. Roman numerals
  • bytes, to hex / 57. Bytes to hex
  • punctuation, removing / 58. Removing punctuation
  • palindromic substrings / 59. Palindromic substrings
  • passwords, validating / 60. Validating passwords
  • edit distance / 61. Edit distance
  • Soundex algorithm / 62. Soundex
  • longest common substring / 63. Longest common substring
• strings, solutions
  • Roman numerals / 56. Roman numerals
  • bytes, to hex / 57. Bytes to hex
  • punctuation, removing / 58. Removing punctuation
  • palindromic substrings / 59. Palindromic substrings
  • passwords, validating / 60. Validating passwords
  • edit distance / 61. Edit distance
  • Soundex, encoding / 62. Soundex
  • longest common substring / 63. Longest common substring

T

• time zone chart / 43. Time zone chart, 43. Time zone chart
• time zone clocks / 45. Time zone clocks, 45. Time zone clocks
• trapezoid / 27. Trapezoid rule integration
• trapezoid rule integration / 27. Trapezoid rule integration
• twin primes / 15. Prime tuples

U

• unique prime factors / 14. Unique prime factors, 14. Unique prime factors

V

• Vigenère cipher / 92. Vigenère cipher, 92. Vigenère cipher

W

• watermarking / 97. Steganography
• weasel program / 82. Dawkins' weasel
• wondrous numbers / 83. Hailstone sequence