Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Learning to program in Perl

For the last few days, I've been teaching Learning to Program in Perl. Unlike a conventional course style, for this one I had been asked to assume no prior programming knowledge, and covered first principles such as variables, conditionals, and loops.

Here is one of the examples I wrote during the course ...

# The bit you do at the start
print "Please enter first number ";
$entry = <STDIN>;
$sofar = 0;
$howmany = 0;
 
# The bit you keep repeating
while ($entry > 0) {
  $sofar += $entry;
  $howmany++;
  print "Please enter next number (0 to end) ";
  $entry = ;
  }
 
# The bit you do at the end
print "The total was $sofar in $howmany entries\n";


You'll note how I have divided a straightforward little application into "the bit that's done once, first", "the bit that's repeated", and "the bit that's done at the end. And you'll note too how important the comments are!

Given a couple of days, we moved on from examples like the one above to a program that was reading and analysing a log file ... and coming out with results. Perl is, after all, the Practical Extraction and Reporting Language
(written 2008-04-11, updated 2008-04-12)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Q904 - Object Orientation and General technical topics - Analysing a Programming Task
  [747] The Fag Packet Design Methodology - (2006-06-06)
  [1345] Perl and Shell coding standards / costs of an IT project - (2007-09-11)
  [1513] Perl, PHP or Python? No - Perl AND PHP AND Python! - (2008-01-20)
  [1850] Daisy the Cow and a Pint of Ginger Beer - (2008-10-21)
  [1853] Well structured coding in Perl - (2008-10-24)
  [2327] Planning! - (2009-08-08)
  [2715] Uploading an image, document or pdf via a browser (php) - (2010-04-10)
  [2834] Teaching examples in Perl - third and final part - (2010-06-27)
  [3329] Perl from basics - (2011-06-20)
  [3366] Specification, Design, Implementation, Testing and Documentation - stages of a (Java) programming project - (2011-07-21)
  [3461] From flowchart to program - code design for the newcomer - (2011-09-29)
  [3895] Flowchart to program - learning to program with Well House - (2012-10-14)

P204 - Perl - Conditionals and Loops
  [353] Wimbledon Neck - (2005-06-20)
  [930] -> , >= and => in Perl - (2006-11-18)
  [1191] Smart English Output - via PHP and Perl ? : operator - (2007-05-18)
  [1468] Lexical v Arithemetic testing, Bash and Perl - (2007-12-11)
  [1477] Decisions - small ones, or big ones? - (2007-12-18)
  [1696] Saying NOT in Perl, PHP, Python, Lua ... - (2008-07-04)
  [1727] Equality and looks like tests - Perl - (2008-07-29)
  [2351] Ternary operators alternatives - Perl and Lua lazy operators - (2009-08-12)
  [2550] Do not copy and paste code - there are much better ways - (2009-12-26)
  [2711] For loop - checked once, or evety time? Ruby v Perl comparison and contrast - (2010-04-07)
  [2832] Are you learning Perl? Some more examples for you! - (2010-06-27)
  [3004] Increment operators for counting - Perl, PHP, C and others - (2010-10-18)
  [3397] Does a for loop evaluate its end condition once, or on every iteration? - (2011-08-18)
  [4031] Showing what programming errors look like - web site pitfall - (2013-03-06)
  [4322] Learning to Program - the conditional statement (if) - (2014-11-21)
  [4323] Learning to program - Loop statements such as while - (2014-11-22)


Back to
Sheep Shearers, Marathon Runners and Ocean Sailors
Previous and next
or
Horse's mouth home
Forward to
Underlining in Perl and Python - the x and * operator in use
Some other Articles
Gauging point at entrance to Bristols Floating Harbour
PHP course dot co, dot uk
Chew Valley Lakes
Underlining in Perl and Python - the x and * operator in use
Learning to program in Perl
Sheep Shearers, Marathon Runners and Ocean Sailors
Learning and understanding scripting programming techniques
M25 / South Mimms Service Area
Do not SHOUT and do not whisper
Automating processes through Expect
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/1607_Lea ... -Perl.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb