Algol68 code samples, view on-line...

View... and then run on-line...

Maybe you want to hack your first "Hello, world!" program and run it on-line right NOW:

• If so, then you HAVE to click here!

To see how easy Concurrent computing is, paste this specimen:

  PAR(
    print("Enjoy "),
    print("Rosetta "),
    print("Code ")
  )

See also: Have you ever wanted to test drive Algol68?... are ANY of the rumours true?

The Algol68 code specimen samples:

9

• 100 doors
• 99 Bottles of Beer

A

• A+B
• ABC Problem
• Accumulator factory
• Ackermann function
• Address of a variable
• AKS test for primes
• Algol 68
• Align columns
• Almost prime
• Amb
• Apply a callback to an array
• Arbitrary-precision integers (included)
• Arithmetic evaluation
• Arithmetic-geometric mean
• Arithmetic/Complex
• Arithmetic/Integer
• Arithmetic/Rational
• Array concatenation
• Arrays
• Assertions
• Associative array/Creation
• Averages/Arithmetic mean
• Averages/Median
• Averages/Pythagorean means
• Averages/Root mean square
• Averages/Simple moving average

B

• Balanced brackets
• Binary digits
• Binary search
• Binary strings
• Birthday problem
• Bitmap
• Bitmap/Bresenham's line algorithm
• Bitmap/Bézier curves/Cubic
• Bitmap/Midpoint circle algorithm
• Bitwise IO
• Bitwise operations
• Boolean values
• Box the compass
• Bulls and cows

C

• Caesar cipher
• Calendar
• Calendar - for "REAL" programmers
• Call a foreign-language function
• Call a function
• Case-sensitivity of identifiers
• Character codes
• Cholesky decomposition
• Classes
• Closures/Value capture
• Combinations
• Combinations and permutations
• Comma quibbling
• Command-line arguments
• Comments
• Compare a list of strings
• Compound data type
• Concurrent computing
• Conditional structures
• Constrained random points on a circle
• Conway's Game of Life
• Copy a string
• Count in factors
• Count in octal
• Count occurrences of a substring
• Count the coins
• CRC-32
• Create a file
• Create a two-dimensional array at runtime
• CSV data manipulation
• CSV to HTML translation
• Currying

D

• Date format
• Day of the week
• Define a primitive data type
• Delegates
• Delete a file
• Detect division by zero
• Determine if a string is numeric
• Digital root/Multiplicative digital root
• Dijkstra's algorithm
• Dot product
• Doubly-linked list/Definition
• Doubly-linked list/Element definition
• Doubly-linked list/Element insertion
• Doubly-linked list/Traversal
• Dragon curve

E

• Element-wise operations
• Empty program
• Empty string
• Enforced immutability
• Entropy
• Enumerations
• Environment variables
• Equilibrium index
• Ethiopian multiplication
• Euler method
• Euler's sum of powers conjecture
• Evaluate binomial coefficients
• Even or odd
• Evolutionary algorithm
• Exceptions
• Exceptions/Catch an exception thrown in a nested call
• Execute a system command
• Execute Brain****
• Exponentiation operator
• Extract file extension

F

• Factorial
• Factors of a Mersenne number
• Factors of an integer
• Fast Fourier transform
• Fibonacci sequence
• Fibonacci word
• File input/output
• File modification time
• File size
• Filter
• Find common directory path
• Find first and last set bit of a long integer
• Find limit of recursion
• First-class functions
• First-class functions/Use numbers analogously
• Five weekends
• FizzBuzz
• Flatten a list
• Flow-control structures
• Floyd's triangle
• Forest fire
• Fork
• Formatted numeric output
• Forward difference
• Function composition
• Function definition
• Function prototype

G

• Gamma function
• Gaussian elimination
• Generalised floating point addition
• Generalised floating point multiplication
• Generate lower case ASCII alphabet
• Generator/Exponential
• Generic swap
• Gray code
• Greatest common divisor
• Greatest element of a list
• Greatest subsequential sum
• Guess the number
• Guess the number/With feedback

H

• Hailstone sequence
• Hamming numbers
• Happy numbers
• Harshad or Niven series
• Haversine formula
• Hello world/Graphical
• Hello world/Line printer
• Hello world/Newbie
• Hello world/Standard error
• Hello world/Text
• Here document
• Higher-order functions
• Hofstadter Q sequence
• Hofstadter-Conway $10,000 sequence
• Holidays related to Easter
• Horizontal sundial calculations
• Horner's rule for polynomial evaluation
• Host introspection
• Hostname
• HTTP

I

• Identity matrix
• Implicit type conversion
• Include a file
• Increment a numerical string
• Infinity
• Input loop
• Integer comparison
• Integer sequence
• Introspection

J

• Jensen's Device

K

• Kahan summation
• Knapsack problem/Unbounded
• Knight's tour
• Knuth shuffle

L

• Leap year
• Least common multiple
• Letter frequency
• Linear congruential generator
• List comprehensions
• Literals/Integer
• Literals/String
• Logical operations
• Long multiplication
• Longest common subsequence
• Longest string challenge
• Look-and-say sequence
• Loop over multiple arrays simultaneously
• Loops/Break
• Loops/Continue
• Loops/Do-while
• Loops/Downward for
• Loops/For
• Loops/For with a specified step
• Loops/Foreach
• Loops/Infinite
• Loops/N plus one half
• Loops/Nested
• Loops/While
• Lucas-Lehmer test
• Luhn test of credit card numbers

M

• Mad Libs
• Man or boy test
• Mandelbrot set
• Matrix multiplication
• Matrix transposition
• Matrix-exponentiation operator
• Maximum triangle path sum
• MD5
• Memory allocation
• Memory layout of a data structure
• Menu
• Metaprogramming
• Metered concurrency
• Middle three digits
• Miller-Rabin primality test
• Modular exponentiation
• Modular inverse
• Monte Carlo methods
• Monty Hall problem
• Move-to-front algorithm
• Multi-dimensional array
• Multiple distinct objects
• Multiplication tables
• Multiplicative order
• Mutual recursion

N

• N'th
• N-queens problem
• Named parameters
• Narcissist
• Native shebang
• Non-continuous subsequences
• Non-decimal radices/Convert
• Non-decimal radices/Input
• Non-decimal radices/Output
• Nth root
• Null object
• Number names
• Numerical integration

O

• Object serialization
• Odd word problem
• Old lady swallowed a fly
• One-dimensional cellular automata
• Operator precedence

P

• Palindrome detection
• Pangram checker
• Parsing/RPN calculator algorithm
• Parsing/RPN to infix conversion
• Partial function application
• Pascal's triangle
• Pascal's triangle/Puzzle
• Perfect numbers
• Permutations
• Permutations with repetitions
• Phrase reversals
• Pi
• Pick random element
• Playing cards
• Plot coordinate pairs
• Pointers and references
• Polynomial regression
• Power set
• Pragmatic directives
• Price fraction
• Primality by trial division
• Prime decomposition
• Probabilistic choice
• Program name
• Program termination

Q

• Quaternion type
• Queue/Definition
• Queue/Usage
• Quine

R

• Random number generator (included)
• Random numbers
• Range expansion
• Range extraction
• Read a file line by line
• Read a specific line from a file
• Read entire file
• Real constants and functions
• Reduced row echelon form
• Regular expressions
• Rename a file
• Rep-string
• Repeat
• Repeat a string
• Return multiple values
• Reverse a string
• Rock-paper-scissors
• Roman numerals/Decode
• Roman numerals/Encode
• Roots of a function
• Roots of a quadratic function
• Roots of unity
• Rosetta Code/Rank languages by popularity
• Rot-13
• RSA code
• Run-length encoding
• Runge-Kutta method
• Runtime evaluation
• Runtime evaluation/In an environment

S

• Search a list
• SEDOLs
• Self-describing numbers
• Sequence of non-squares
• Seven-sided dice from five-sided dice
• Shell one-liner
• Short-circuit evaluation
• Sierpinski carpet
• Sierpinski triangle
• Sieve of Eratosthenes
• Singly-linked list/Element definition
• Singly-linked list/Element insertion
• Singly-linked list/Traversal
• Sleep
• Sort an array of composite structures
• Sort an integer array
• Sorting algorithms/Bogosort
• Sorting algorithms/Bubble sort
• Sorting algorithms/Cocktail sort
• Sorting algorithms/Counting sort
• Sorting algorithms/Gnome sort
• Sorting algorithms/Heapsort
• Sorting algorithms/Insertion sort
• Sorting algorithms/Merge sort
• Sorting algorithms/Quicksort
• Sorting algorithms/Radix sort
• Sorting algorithms/Selection sort
• Sorting algorithms/Shell sort
• Soundex
• Special characters
• Special variables
• Spiral matrix
• Stack
• Stair-climbing puzzle
• Standard deviation
• Straddling checkerboard
• String append
• String case
• String concatenation
• String interpolation (included)
• String length
• String matching
• String prepend
• Strip a set of characters from a string
• Strip comments from a string
• Strip whitespace from a string/Top and tail
• Substring
• Substring/Top and tail
• Sudoku
• Sum and product of an array
• Sum digits of an integer
• Sum of a series
• Sum of squares
• Synchronous concurrency
• System time

T

• Table creation/Postal addresses
• Temperature conversion
• Ternary logic
• Text processing/1
• Text processing/Max licenses in use
• Thiele's interpolation formula
• Tokenize a string
• Towers of Hanoi
• Tree traversal
• Trigonometric functions
• Truncatable primes

U

• Undefined values
• Unicode strings
• Unicode variable names
• User defined pipe and redirection operators
• User input/Text

V

• Variable size/Get
• Variables
• Variadic function
• Vector products
• Vigenère cipher

W

• Walk a directory/Non-recursively
• Walk a directory/Recursively
• Web scraping
• Window creation
• Window creation/X11
• Wireworld
• Write float arrays to a text file

Y

• Y combinator
• Yin and yang

Z

• Zero to the zero power
• Zig-zag matrix