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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Lots of ways of doing it in Perl - printing out answers

"There's more than one way to do it". So says the first book in our Perl Library - Perl Programming, also known as "The Camel Book". And that eclectic collection of lots of ways of doing the same thing applies all over Perl; when I'm running Perl Courses, I'm often asked "how do I ..." questions and have to think for a moment as to which of multiple ways I'll suggest. Such suggestions are then, of course, based on practicality, maintainability, efficiency, and the customer's standards if (s)he has any, and his / her current knowledge.

It was a Long hot summer. And here are three lines of Perl which print out that fact, filling in the word hot from a variable:
  print "Long ",$heat," summer\n";
  print "Long ".$heat." summer\n";
  print "Long $heat summer\n";


In the first example, I'm passing a list of three parameters to the print function and it's outputting them after each other. In the second, I'm using the "." operator to join three strings together and passing a single parameter to print. And in the third case, the double quote operator is being used to substitute the contents of a variable within a string.

None of these three example is particularly THE right or wrong way. But none of them is particularly exotic. I say to classes that there's usually six ways of doing things, so I should add three more ...
  print join " ","Long",$heat,"summer\n";
  printf "Long %s summer\n",$heat;
  print "Long ${heat} summer\n";

and I could find even further examples





Full source including example lines used above - [here]

Illustration - Guadalajara, Mexico, where I presented a Lua Course last summer!



(written 2010-10-19, updated 2010-10-21)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P205 - Perl - Initial String Handling
  [31] Here documents - (2004-08-28)
  [254] x operator in Perl - (2005-03-22)
  [324] The backtick operator in Python and Perl - (2005-05-25)
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [1195] Regular Express Primer - (2007-05-20)
  [1608] Underlining in Perl and Python - the x and * operator in use - (2008-04-12)
  [1849] String matching in Perl with Regular Expressions - (2008-10-20)
  [1860] Seven new intermediate Perl examples - (2008-10-30)
  [2798] Perl - skip the classics and use regular expressions - (2010-06-08)
  [2816] Intelligent Matching in Perl - (2010-06-18)
  [2832] Are you learning Perl? Some more examples for you! - (2010-06-27)
  [2963] Removing the new line with chop or chomp in Perl - what is the difference? - (2010-09-21)
  [3411] Single and double quotes strings in Perl - what is the difference? - (2011-08-30)
  [3547] Using Perl to generate multiple reports from a HUGE file, efficiently - (2011-12-09)
  [3548] Dark mornings, dog update, and Python and Lua courses before Christmas - (2011-12-10)
  [3770] Sample answers to training course exercises - available on our web site - (2012-06-21)


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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.

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