Exercises on the C Track | Exercism

🎉 Exercism Research is now launched. Help Exercism, help science and have some fun at research.exercism.io 🎉

Hello World

The classical introductory exercise. Just say "Hello, World!"

Armstrong Numbers

Determine if a number is an Armstrong number

control flow if else statements

control flow loops

Darts

Write a function that returns the earned points in a single toss of a Darts game

control flow if else statements

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.

Isogram

Determine if a word or phrase is an isogram.

control flow if else statements

control flow loops

Acronym

Convert a long phrase to its acronym

control flow loops

memory management

Word Count

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

memory management

Pangram

Determine if a sentence is a pangram.

control flow if else statements

control flow loops

Gigasecond

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

Space Age

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

Meetup

Calculate the date of meetups.

control flow if statements

preprocessor x macros in test

Hamming

Calculate the Hamming difference between two DNA strands.

control flow loops

RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.

control flow case statements

control flow loops

Nucleotide Count

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

control flow loops switch if statements

memory management

text formatting

Grains

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

bitwise operations

control flow loops

performance optimizations

Leap

Given a year, report if it is a leap year.

control flow if else statements

Beer Song

Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.

control flow if else statements

control flow loops

Raindrops

Convert a number to a string, the content of which depends on the number's factors.

control flow if else statements

Bob

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

control flow if else statements

Difference Of Squares

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

control flow loops

Sum Of Multiples

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

control flow case statements

control flow loops

Square Root

Given a natural radicand, return its square root.

control flow loops

bitwise operations

Grade School

Given students' names along with the grade that they are in, create a roster for the school

control flow if else statements

control flow loops

Binary Search

Implement a binary search algorithm.

control flow if else statements

control flow loops

Anagram

Given a word and a list of possible anagrams, select the correct sublist.

Rational Numbers

Implement rational numbers.

Roman Numerals

Write a function to convert from normal numbers to Roman Numerals.

control flow loops

memory management

Circular Buffer

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

control flow if else statements

control flow loops

memory management

flexible array members

List Ops

Implement basic list operations

control flow if else statements

control flow loops

memory management

function pointers

flexible array members

Pythagorean Triplet

There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product a * b * c.

control flow if else statements

control flow loops

memory management

flexible array members

Saddle Points

Detect saddle points in a matrix.

control flow if else statements

control flow loops

memory management

flexible array members

Allergies

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

control flow if statements

control flow loops

memory management

Atbash Cipher

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

control flow if else statements

control flow loops

Series

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

control flow if statements

memory management

text formatting

React

Implement a basic reactive system.

memory management

Phone Number

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

control flow if else statements

control flow loops

memory management

Clock

Implement a clock that handles times without dates.

control flow if statements

preprocessor x macros in test

text formatting

Sieve

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

control flow if statements

memory management

Nth Prime

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

control flow if else statements

control flow loops

performance optimizations

Robot Simulator

Write a robot simulator.

control flow if statements

variable argument lists

Pascal's Triangle

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

control flow if else statements

memory management

Triangle

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

control flow if else statements

Perfect Numbers

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

control flow if else statements

Collatz Conjecture

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

Binary

Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles

control flow if statements

control flow loops

All Your Base

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

control flow if else statements

control flow loops

Palindrome Products

Detect palindrome products in a given range.

Sublist

Write a function to determine if a list is a sublist of another list.

control flow if statements

control flow loops

Largest Series Product

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

control flow loops

performance optimizations

Scrabble Score

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

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.

control flow if statements

Linked List

Implement a doubly linked list

Complex Numbers

Implement complex numbers.

performance optimizations

ETL

We are going to do the `Transform` step of an Extract-Transform-Load.

Prime Factors

Compute the prime factors of a given natural number.

Luhn

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

Matching Brackets

Make sure the brackets and braces all match.

control flow if statements

Say

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

control flow if statements

Crypto Square

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

control flow if statements

Secret Handshake

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

control flow if statements

Pig Latin

Implement a program that translates from English to Pig Latin

control flow if statements

Minesweeper

Add the numbers to a minesweeper board

control flow if statements

Run Length Encoding

Implement run-length encoding and decoding.

control flow if statements

Two Fer

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

control flow if statements

Wordy

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

control flow if statements

Binary Search Tree

Insert and search for numbers in a binary tree.

control flow loops

Diamond

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

control flow if statements

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

control flow if statements