C Track Management

This page provides the Exercism community with the information and tools needed to manage the C track.

Students
96,228
Submissions
948,731
Mentoring Discussions
7,909

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Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Synced primary repo: e14c2bd6099708660212962d5cffa9a9dd8501b4 (Updates should be instant)

Next goal: Implement 131 practice exercises. Find out more.
82 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
72,238
254,536 (avg. 3.5)
32,403 (44.9%)
20 (0.0%)
Leap Leap
4,217
18,726 (avg. 4.4)
2,639 (62.6%)
130 (3.1%)
Difference of Squares Difference of Squares
4,826
24,060 (avg. 5.0)
3,926 (81.4%)
352 (7.3%)
Grains Grains
5,142
38,185 (avg. 7.4)
3,975 (77.3%)
476 (9.3%)
Resistor Color Resistor Color
6,673
42,887 (avg. 6.4)
3,427 (51.4%)
654 (9.8%)
Collatz Conjecture Collatz Conjecture
1,117
5,540 (avg. 5.0)
933 (83.5%)
40 (3.6%)
Queen Attack Queen Attack
1,104
6,294 (avg. 5.7)
823 (74.5%)
45 (4.1%)
Darts Darts
2,501
7,582 (avg. 3.0)
1,725 (69.0%)
77 (3.1%)
Resistor Color Duo Resistor Color Duo
1,580
4,083 (avg. 2.6)
1,202 (76.1%)
24 (1.5%)
Hamming Hamming
4,993
24,130 (avg. 4.8)
3,999 (80.1%)
585 (11.7%)
Space Age Space Age
1,434
4,767 (avg. 3.3)
1,119 (78.0%)
27 (1.9%)
RNA Transcription RNA Transcription
1,186
6,447 (avg. 5.4)
941 (79.3%)
43 (3.6%)
Binary Binary
1,319
9,172 (avg. 7.0)
1,019 (77.3%)
54 (4.1%)
Eliud's Eggs Eliud's Eggs
349
1,485 (avg. 4.3)
271 (77.7%)
3 (0.9%)
Two Fer Two Fer
855
3,745 (avg. 4.4)
678 (79.3%)
15 (1.8%)
Raindrops Raindrops
1,047
4,245 (avg. 4.1)
836 (79.8%)
23 (2.2%)
D&D Character D&D Character
262
1,959 (avg. 7.5)
187 (71.4%)
7 (2.7%)
Perfect Numbers Perfect Numbers
606
2,537 (avg. 4.2)
457 (75.4%)
5 (0.8%)
High Scores High Scores
541
4,454 (avg. 8.2)
384 (71.0%)
15 (2.8%)
Pangram Pangram
1,512
7,072 (avg. 4.7)
1,145 (75.7%)
49 (3.2%)
Resistor Color Trio Resistor Color Trio
1,190
5,152 (avg. 4.3)
874 (73.4%)
24 (2.0%)
Armstrong Numbers Armstrong Numbers
20,659
111,309 (avg. 5.4)
8,346 (40.4%)
1,736 (8.4%)
Isogram Isogram
9,056
85,064 (avg. 9.4)
4,968 (54.9%)
1,417 (15.6%)
Binary Search Binary Search
2,709
22,771 (avg. 8.4)
1,812 (66.9%)
201 (7.4%)
Robot Simulator Robot Simulator
1,040
3,918 (avg. 3.8)
706 (67.9%)
46 (4.4%)
Gigasecond Gigasecond
1,500
2,895 (avg. 1.9)
1,118 (74.5%)
133 (8.9%)
Triangle Triangle
739
3,344 (avg. 4.5)
492 (66.6%)
10 (1.4%)
Luhn Luhn
613
5,244 (avg. 8.6)
414 (67.5%)
25 (4.1%)
Allergies Allergies
1,029
5,077 (avg. 4.9)
698 (67.8%)
52 (5.1%)
Complex Numbers Complex Numbers
580
1,801 (avg. 3.1)
449 (77.4%)
4 (0.7%)
Sum of Multiples Sum of Multiples
718
2,837 (avg. 4.0)
492 (68.5%)
14 (1.9%)
Clock Clock
1,028
6,773 (avg. 6.6)
633 (61.6%)
43 (4.2%)
Rotational Cipher Rotational Cipher
134
1,039 (avg. 7.8)
108 (80.6%)
4 (3.0%)
Sieve Sieve
938
4,891 (avg. 5.2)
680 (72.5%)
39 (4.2%)
Square Root Square Root
2,991
11,601 (avg. 3.9)
2,041 (68.2%)
214 (7.2%)
Reverse String Reverse String
1,171
10,192 (avg. 8.7)
856 (73.1%)
36 (3.1%)
Nucleotide Count Nucleotide Count
916
5,886 (avg. 6.4)
674 (73.6%)
23 (2.5%)
Protein Translation Protein Translation
169
1,619 (avg. 9.6)
120 (71.0%)
1 (0.6%)
Beer Song Beer Song
846
3,758 (avg. 4.4)
559 (66.1%)
114 (13.5%)
Prime Factors Prime Factors
483
1,454 (avg. 3.0)
331 (68.5%)
7 (1.4%)
Nth Prime Nth Prime
528
1,889 (avg. 3.6)
358 (67.8%)
8 (1.5%)
All Your Base All Your Base
519
2,746 (avg. 5.3)
293 (56.5%)
10 (1.9%)
Yacht Yacht
100
899 (avg. 9.0)
74 (74.0%)
1 (1.0%)
Scrabble Score Scrabble Score
573
2,354 (avg. 4.1)
453 (79.1%)
23 (4.0%)
Sublist Sublist
418
1,742 (avg. 4.2)
254 (60.8%)
10 (2.4%)
Kindergarten Garden Kindergarten Garden
130
820 (avg. 6.3)
89 (68.5%)
0 (0.0%)
Spiral Matrix Spiral Matrix
116
855 (avg. 7.4)
70 (60.3%)
1 (0.9%)
Grade School Grade School
2,434
25,653 (avg. 10.5)
998 (41.0%)
165 (6.8%)
Rational Numbers Rational Numbers
1,238
11,659 (avg. 9.4)
757 (61.1%)
86 (6.9%)
Circular Buffer Circular Buffer
1,657
16,646 (avg. 10.0)
847 (51.1%)
104 (6.3%)
List Ops List Ops
1,329
9,885 (avg. 7.4)
728 (54.8%)
77 (5.8%)
Saddle Points Saddle Points
744
4,531 (avg. 6.1)
427 (57.4%)
36 (4.8%)
Phone Number Phone Number
802
6,774 (avg. 8.4)
523 (65.2%)
48 (6.0%)
Pascal's Triangle Pascal's Triangle
801
3,891 (avg. 4.9)
496 (61.9%)
37 (4.6%)
Acronym Acronym
2,088
9,684 (avg. 4.6)
1,392 (66.7%)
120 (5.7%)
Matching Brackets Matching Brackets
779
2,793 (avg. 3.6)
532 (68.3%)
52 (6.7%)
Roman Numerals Roman Numerals
953
14,711 (avg. 15.4)
632 (66.3%)
71 (7.5%)
Anagram Anagram
636
2,161 (avg. 3.4)
427 (67.1%)
15 (2.4%)
Bob Bob
777
4,160 (avg. 5.4)
559 (71.9%)
21 (2.7%)
Secret Handshake Secret Handshake
576
3,320 (avg. 5.8)
403 (70.0%)
16 (2.8%)
ETL ETL
395
1,650 (avg. 4.2)
266 (67.3%)
8 (2.0%)
Series Series
510
2,250 (avg. 4.4)
331 (64.9%)
6 (1.2%)
Diamond Diamond
385
1,500 (avg. 3.9)
261 (67.8%)
6 (1.6%)
Minesweeper Minesweeper
399
1,850 (avg. 4.6)
242 (60.7%)
8 (2.0%)
Run-Length Encoding Run-Length Encoding
362
2,075 (avg. 5.7)
221 (61.0%)
9 (2.5%)
Atbash Cipher Atbash Cipher
444
1,883 (avg. 4.2)
304 (68.5%)
32 (7.2%)
Pythagorean Triplet Pythagorean Triplet
984
5,138 (avg. 5.2)
483 (49.1%)
50 (5.1%)
Linked List Linked List
1,061
8,329 (avg. 7.9)
555 (52.3%)
82 (7.7%)
Word Count Word Count
1,627
4,531 (avg. 2.8)
759 (46.7%)
194 (11.9%)
Rail Fence Cipher Rail Fence Cipher
431
2,512 (avg. 5.8)
279 (64.7%)
9 (2.1%)
Meetup Meetup
688
1,405 (avg. 2.0)
373 (54.2%)
10 (1.5%)
Pig Latin Pig Latin
375
2,761 (avg. 7.4)
233 (62.1%)
10 (2.7%)
Wordy Wordy
364
2,040 (avg. 5.6)
229 (62.9%)
12 (3.3%)
Crypto Square Crypto Square
295
1,370 (avg. 4.6)
189 (64.1%)
1 (0.3%)
Largest Series Product Largest Series Product
414
2,106 (avg. 5.1)
274 (66.2%)
8 (1.9%)
Zebra Puzzle Zebra Puzzle
76
497 (avg. 6.5)
36 (47.4%)
0 (0.0%)
Two Bucket Two Bucket
252
1,295 (avg. 5.1)
147 (58.3%)
3 (1.2%)
Binary Search Tree Binary Search Tree
540
2,529 (avg. 4.7)
286 (53.0%)
30 (5.6%)
Say Say
306
1,800 (avg. 5.9)
176 (57.5%)
5 (1.6%)
Knapsack Knapsack
80
532 (avg. 6.7)
42 (52.5%)
1 (1.3%)
Palindrome Products Palindrome Products
405
1,728 (avg. 4.3)
207 (51.1%)
14 (3.5%)
React React
740
3,246 (avg. 4.4)
179 (24.2%)
20 (2.7%)
49 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Bank Account Bank Account
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Connect Connect
Conway's Game of Life Conway's Game of Life
Custom Set Custom Set
Dominoes Dominoes
DOT DSL DOT DSL
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
House House
ISBN Verifier ISBN Verifier
Killer Sudoku Helper Killer Sudoku Helper
Ledger Ledger
Lens Person Lens Person
Markdown Markdown
Matrix Matrix
Micro Blog Micro Blog
OCR Numbers OCR Numbers
PaaS I/O PaaS I/O
Parallel Letter Frequency Parallel Letter Frequency
Poker Poker
POV POV
Proverb Proverb
Rectangles Rectangles
REST API REST API
Robot Name Robot Name
Satellite Satellite
SGF Parsing SGF Parsing
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Twelve Days Twelve Days
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Zipper Zipper

Programming Tags

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Help manage the tags used to group, filter and recommend solutions, approaches and articles.

0 tags

Test Runner

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Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Current version: 85de992c2079429d1db3f24b6ba5e4041b5f9b03 (Takes up to 10 mins to deploy)

Total Test Runner Runs
920,778
Test Run Pass Rate
13.6% (124860)
Test Run Fail Rate
21.2% (195531)
Test Run Error Rate
65.2% (600387)

Representer

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Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

Next goal: Build a Representer. Find out more.

Analyzer

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Build an Analyzer for C: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.