Cynnovative Coding Exercise

Fork this repository, answer the questions in whichever form you want (e.g. .txt, add new README.md files, etc.), build your Dockerized programs in the language of your choice, then submit a pull request with your code.

Question 1 - How big is this file?

The file shown in the following screenshot, with MIME type text/plain is seemingly small. What is the file's size in bytes?

Question 2 - Python and Switch Statements

The programming language Python does not have a switch construct. What is a way of recreating a switch statement in Python? Write an example that will use the following list of values as cases and actions:

Value: 'red', Action: paintItRed()
Value: 'green', Action: paintItGreen()
Value: 'blue', Action: paintItBlue()
Value: 'default', Action: paintIt()

Question 3 - Java Memory

Java uses Heap memory and Stack memory. Can you describe all the differences between them?

Question 4 - Binary File Analysis

Binary file analysis take variou forms. Write a Dockerized program, in the language of your choice, that finds all the printable strings in an input binary file and prints them out to stdout.

Example of desired functionality:

$ docker build -t $YOUR_DOCKER_IMAGE Dockerfile
$ docker run -it $YOUR_DOCKER_IMAGE find_strings /bin/ls
$ Corresponding Output:
  $FreeBSD: src/bin/ls/cmp.c,v 1.12 2002/06/30 05:13:54 obrien Exp $
  @(#) Copyright (c) 1989, 1993, 1994
  The Regents of the University of California.  All rights reserved.
  $FreeBSD: src/bin/ls/ls.c,v 1.66 2002/09/21 01:28:36 wollman Exp $
  $FreeBSD: src/bin/ls/print.c,v 1.57 2002/08/29 14:29:09 keramida Exp $
  $FreeBSD: src/bin/ls/util.c,v 1.38 2005/06/03 11:05:58 dd Exp $
  \\""
  @(#)PROGRAM:ls  PROJECT:file_cmds-287.40.2
  fffff
  COLUMNS
  1@ABCFGHLOPRSTUWabcdefghiklmnopqrstuvwx%
  bin/ls
  Unix2003
  CLICOLOR
  ...

Question 5 - Circular Prime Numbers

A very interesting mathematical concept is that of circular prime numbers. A circular prime number is a prime number p that, when rearraging its digits, all the possible combinations are also prime.

For example, the number 13 is a circular prime because 13 and 31 are primes.

Create a Dockerized program, in the language of your choice, that finds all the circular prime numbers below 500000.

Example of desired functionality:

$ docker build -t $YOUR_DOCKER_IMAGE Dockerfile
$ docker run -it $YOUR_DOCKER_IMAGE circular_primes
$ Corresponding Output:
  2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, ...