x86-64 Assembly

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x86-64 assembly is the programming language for the 64-bit version of the x86 instruction set. It is based on the original 8086 instruction set from 1978. Assembly language is different from high-level languages like C# and Java. There are no variables, objects, or loops. Instead, you'll have to deal with registers, memory addresses, and jumps.

Syllabus

Hello World

Exercism's classic introductory exercise. Just say "Hello, World!".

Lasagna

Learn about the basics of x86-64 assembly by following a lasagna recipe.

Inventory Management

Learn about integers by managing transport of products for a local store.

Black Jack

Learn about comparisons by implementing some Black Jack judging rules.

Color Palette

Learn about declaring, accessing and modifying initialized data by mixing colors.

Bird Watcher

Save and update counts for birds in your garden using arrays.

Secrets

Learn about bit manipulation by writing the software for an encryption device.

Mixed Juices

Help your friend Li Mei run her juice bar with your knowledge of loops.

Poetry Club Door Policy

Learn about strings using poems to get into the poetry club.

Freelancer Rates

Learn about floating-point numbers by helping a freelancer communicate with a project manager about billing.

Lost and Found

Learn about the call stack by organizing items for a lost-and-found office.

Currency Exchange

Learn how to interface with C types by solving Chandler's currency exchange conundrums.

Need For Speed

Learn about how to interface with C structs in x86-64 assembly code by racing remote controlled cars.

Piper's Pie

Learn about recursion in x86-64 assembly.

Bookkeeping

Learn about thunks in x86-64 assembly.

Pocket Console

Learn about branchless code in x86-64 assembly.

Production Line

Learn about SIMD instructions in x86-64 assembly.

Mixing Console

Learn about SIMD operations with packed integers in x86-64 assembly.

Seismograph

Learn about bitwise and shift ops on packed values in x86-64 assembly.

Grade Sheet

Learn about SIMD comparisons and masks in x86-64 assembly.

Channel Swizzle

Learn about SIMD cross-lane operations in x86-64 assembly.

Magazine Layout

Learn about macros in the NASM assembler.

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture.

Darts

Calculate the points scored in a single toss of a Darts game.

Difference of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

Leap

Determine whether a given year is a leap year.

Reverse String

Reverse a given string.

RNA Transcription

Given a DNA strand, return its RNA complement.

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.

Square Root

Given a natural radicand, return its square root.

Triangle

Determine if a triangle is equilateral, isosceles, or scalene.

Two-Fer

Create a sentence of the form "One for X, one for me.".

Grains

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.

Hamming

Calculate the Hamming distance between two DNA strands.

High Scores

Manage a player's High Score list.

Line Up

Help lining up customers at Yaʻqūb's Deli.

Pangram

Determine whether a phrase uses every letter in the Latin alphabet.

Queen Attack

Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

Binary Search

Implement a binary search algorithm.

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Clock

Implement a clock that handles times without dates.

Eliud's Eggs

Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.

Change the data format for scoring a game to more easily add other languages.

Isogram

Determine whether a phrase is an isogram, a word with no repeated letters.

Micro Blog

Given an input string, truncate it to 5 characters.

Nucleotide Count

Given a DNA string, compute how many times each nucleotide occurs in the string.

Resistor Color

Convert a resistor band's color to its numeric representation.

Resistor Color Duo

Convert color codes, as used on resistors, to a numeric value.

Resistor Color Trio

Convert color codes, as used on resistors, to a human-readable label.

Scrabble Score

Given a word, compute the Scrabble score for that word.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Series

Given a string of digits, output all the contiguous substrings of length `n` in that string.

Sublist

Determine if a list is a sublist of another list.

Acronym

Convert a long phrase to its acronym.

Anagram

Find the words that use the same letters as another word.

Armstrong Numbers

Determine if a number is an Armstrong number.

Bottle Song

Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.

Crypto Square

Implement the classic method for composing secret messages called a square code.

Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

ISBN Verifier

Check if a given string is a valid ISBN-10 number.

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.

Linked List

Implement a doubly linked list.

Matrix

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.

Prime Factors

Compute the prime factors of a given natural number.

Protein Translation

Translate RNA sequences into proteins.

Proverb

For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

Robot Name

Manage robot factory settings.

Robot Simulator

Write a robot simulator.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

Saddle Points

Detect saddle points in a matrix.

Simple Linked List

Write a simple linked list implementation that uses Elements and a List.

Sum of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.

Strain

Implement the `keep` and `discard` operation on collections.

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'.

Word Count

Given a phrase, count the occurrences of each word in that phrase.

Atbash Cipher

Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.

Binary Search Tree

Insert and search for numbers in a binary tree.

Circular Buffer

A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.

Custom Set

Create a custom set type.

D&D Character

Randomly generate Dungeons & Dragons characters.

Flatten Array

Take a nested list and return a single list with all values except nil/null.

Gigasecond

Given a moment, determine the moment that would be after a gigasecond has passed.

House

Output the nursery rhyme 'This is the House that Jack Built'.

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

List Ops

Implement basic list operations.

Matching Brackets

Make sure the brackets and braces all match.

Nth Prime

Given a number n, determine what the nth prime is.

Perfect Numbers

Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.

Raindrops

Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.

Rational Numbers

Implement rational numbers.

Run-Length Encoding

Implement run-length encoding and decoding.

Save the Cow

Implement a word-guessing game.

Sieve

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Split-Second Stopwatch

Keep track of time through a digital stopwatch.

Yacht

Score a single throw of dice in the game Yacht.

Camicia

Simulate the card game and determine whether the match ends or enters an infinite loop.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.

Intergalactic Transmission

Add parity bits to a message for transmission

Killer Sudoku Helper

Write a tool that makes it easier to solve Killer Sudokus

Luhn

Given a number determine whether or not it is valid per the Luhn formula.

OCR Numbers

Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.

Palindrome Products

Detect palindrome products in a given range.

Pascal's Triangle

Compute Pascal's triangle up to a given number of rows.

Pig Latin

Implement a program that translates from English to Pig Latin.

Pythagorean Triplet

Given an integer N, find all Pythagorean triplets for which a + b + c = N.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Affine Cipher

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.

Baffling Birthdays

Estimate the birthday paradox's probabilities.

Complex Numbers

Implement complex numbers.

Flower Field

Mark all the flowers in a garden.

Prism

Calculate the path of a laser through refractive prisms.

Given a number from 0 to 999,999,999,999, spell out that number in English.

State of Tic-Tac-Toe

Determine the game state of a match of Tic-Tac-Toe.

Tournament

Tally the results of a small football competition.

Transpose

Take input text and output it transposed.

Wordy

Parse and evaluate simple math word problems returning the answer as an integer.

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.

Book Store

To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.