COBOL

1,155 students

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Exercises

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11 contributors

32 mentors

1,155
students have developed their COBOL skills on Exercism.

Students

1,155

Submissions

17,845

Mentoring Discussions

The COBOL track needs attention ⚠️

Building

Build

Use your knowledge to build the COBOL track itself

11 contributors

Build Test Runners

Learn More

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

Next goal: Get Test Runners to Version 2. COBOL is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs

17,741

Test Run Pass Rate

14.4% (2557)

Test Run Fail Rate

84.2% (14931)

Test Run Error Rate

1.4% (253)

Build Analyzers

Learn More

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

Next goal: Build an Analyzer. Find out more.

Build Representers

Learn More

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.

Create Practice Exercises

Learn More

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.

Next goal: Implement at least 30 practice exercises. Find out more.

Usage statistics

24 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello, World!

919

2,090 (avg. 2.3)

626 (68.1%)

0 (0.0%)

Leap

435

3,334 (avg. 7.7)

128 (29.4%)

12 (2.8%)

Yacht

128

2,893 (avg. 22.6)

48 (37.5%)

7 (5.5%)

Pangram

1,297 (avg. 13.9)

47 (50.5%)

3 (3.2%)

Isogram

401 (avg. 7.7)

35 (67.3%)

2 (3.8%)

Rotational Cipher

869 (avg. 22.9)

29 (76.3%)

3 (7.9%)

RNA Transcription

305 (avg. 6.9)

36 (81.8%)

0 (0.0%)

Reverse String

647 (avg. 10.0)

44 (67.7%)

0 (0.0%)

Bob

950 (avg. 27.9)

21 (61.8%)

1 (2.9%)

Collatz Conjecture

347 (avg. 12.0)

23 (79.3%)

0 (0.0%)

Difference of Squares

278 (avg. 11.6)

20 (83.3%)

0 (0.0%)

Hamming Distance

174 (avg. 7.3)

21 (87.5%)

0 (0.0%)

Two-Fer

303 (avg. 8.0)

31 (81.6%)

0 (0.0%)

Raindrops

420 (avg. 15.6)

21 (77.8%)

1 (3.7%)

Luhn Algorithm

787 (avg. 29.1)

18 (66.7%)

0 (0.0%)

Darts

318 (avg. 12.7)

20 (80.0%)

0 (0.0%)

Sieve

353 (avg. 17.7)

13 (65.0%)

0 (0.0%)

Armstrong Numbers

534 (avg. 17.8)

20 (66.7%)

0 (0.0%)

Square Root

143 (avg. 3.9)

25 (67.6%)

1 (2.7%)

Nucleotide Count

93 (avg. 4.7)

18 (90.0%)

0 (0.0%)

Roman Numerals

485 (avg. 21.1)

17 (73.9%)

0 (0.0%)

Triangle

326 (avg. 10.9)

17 (56.7%)

0 (0.0%)

Scrabble Score

161 (avg. 8.1)

16 (80.0%)

0 (0.0%)

Queen Attack

337 (avg. 16.9)

16 (80.0%)

0 (0.0%)

104 unimplemented practice exercises

Acronym

Affine Cipher

All Your Base

Allergies

Alphametics

Anagram

Atbash Cipher

Bank Account

Binary Search

Binary Search Tree

Book Store

Bottle Song

Bowling

Change

Circular Buffer

Clock

Complex Numbers

Connect

Crypto Square

Custom Set

D&D Character

DOT DSL

Diamond

Dominoes

ETL

Error Handling

Flatten Array

Food Chain

Forth

Gigasecond

Go Counting

Grade School

Grains

Grep

Hangman

High Scores

House

ISBN Verifier

Killer Sudoku Helper

Kindergarten Garden

Knapsack

Largest Series Product

Ledger

Lens Person

Linked List

List Ops

Markdown

Matching Brackets

Matrix

Meetup

Micro Blog

Minesweeper

Nth Prime

OCR Numbers

POV

PaaS I/O

Palindrome Products

Parallel Letter Frequency

Pascal's Triangle

Perfect Numbers

Phone Number

Pig Latin

Poker

Prime Factors

Protein Translation

Proverb

Pythagorean Triplet

REST API

Rail Fence Cipher

Rational Numbers

React

Rectangles

Resistor Color

Resistor Color Duo

Resistor Color Trio

Robot Name

Robot Simulator

Run-Length Encoding

SGF Parsing

Saddle Points

Satellite

Say

Scale Generator

Secret Handshake

Series

Simple Cipher

Simple Linked List

Space Age

Spiral Matrix

State of Tic-Tac-Toe

Strain

Sublist

Sum of Multiples

Tournament

Transpose

Tree Building

Twelve Days

Two Bucket

Variable Length Quantity

Word Count

Word Search

Wordy

Zebra Puzzle

Zipper

Volunteers

KTSnowy

763

axtens

593

0xE282B0

292

+ 2 more

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Your Journey

Community Videos

Brief Introduction Series

Interviews & Stories

Discord

Forum

Getting started

Mentoring

Docs

Contributors

About Exercism

Our Impact

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Insiders

SWAG

1,155 students have developed their COBOL skills on Exercism.

The COBOL track needs attention ⚠️

Build

Build Test Runners

Usage statistics

Build Analyzers

Build Representers

Create Practice Exercises

Usage statistics

We 💙 our volunteers

1,155
students have developed their COBOL skills on Exercism.