COBOL

918 students

About

Exercises

Build Status

10 contributors

32 mentors

917
students have developed their COBOL skills on Exercism.

Students

917

Submissions

13,022

Mentoring Discussions

The COBOL track needs attention ⚠️

Building

Build

Use your knowledge to build the COBOL track itself

10 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

12,941

Test Run Pass Rate

15.7% (2032)

Test Run Fail Rate

83.0% (10736)

Test Run Error Rate

1.3% (173)

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!

720

1,663 (avg. 2.3)

498 (69.2%)

0 (0.0%)

Leap

349

2,361 (avg. 6.8)

97 (27.8%)

9 (2.6%)

Yacht

2,148 (avg. 21.9)

36 (36.7%)

5 (5.1%)

Pangram

990 (avg. 13.9)

37 (52.1%)

3 (4.2%)

Isogram

272 (avg. 7.2)

25 (65.8%)

2 (5.3%)

Rotational Cipher

523 (avg. 19.4)

21 (77.8%)

3 (11.1%)

RNA Transcription

154 (avg. 4.8)

25 (78.1%)

0 (0.0%)

Reverse String

507 (avg. 10.6)

32 (66.7%)

0 (0.0%)

Bob

764 (avg. 29.4)

15 (57.7%)

1 (3.8%)

Collatz Conjecture

274 (avg. 12.5)

16 (72.7%)

0 (0.0%)

Difference of Squares

225 (avg. 13.2)

14 (82.4%)

0 (0.0%)

Hamming Distance

126 (avg. 7.4)

14 (82.4%)

0 (0.0%)

Two-Fer

205 (avg. 7.9)

22 (84.6%)

0 (0.0%)

Raindrops

238 (avg. 12.5)

14 (73.7%)

0 (0.0%)

Luhn Algorithm

602 (avg. 33.4)

13 (72.2%)

0 (0.0%)

Darts

262 (avg. 13.8)

15 (78.9%)

0 (0.0%)

Sieve

243 (avg. 16.2)

9 (60.0%)

0 (0.0%)

Armstrong Numbers

399 (avg. 18.1)

15 (68.2%)

0 (0.0%)

Square Root

77 (avg. 3.1)

19 (76.0%)

1 (4.0%)

Nucleotide Count

80 (avg. 5.0)

14 (87.5%)

0 (0.0%)

Roman Numerals

365 (avg. 20.3)

13 (72.2%)

0 (0.0%)

Triangle

156 (avg. 6.8)

13 (56.5%)

0 (0.0%)

Scrabble Score

120 (avg. 8.0)

12 (80.0%)

0 (0.0%)

Queen Attack

268 (avg. 16.8)

12 (75.0%)

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

588

0xE282B0

292

+ 1 more

We 💙 our volunteers

Exercism relies on open-source volunteers to build our language tracks and mentor students.

Become an Exercism Volunteer

917 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

917
students have developed their COBOL skills on Exercism.