The tutor continues with some explanation of last post’s Perl random walk simulation. Below is the Perl code from last post, this time with some comments (recall that # denotes a comment in Perl): #!/usr/bin/perl # needed for Linux (Unix) …
The tutor returns to Perl programming with a random walk simulation. A really simple conception of a random walk is that the walker starts at 0 on the number line, then makes consecutive steps, each of which can either be …
The tutor continues about command-line math. Back on April 6 I showed how to use awk to do calculations on the command line. From my understanding, awk is native to Linux, but not Windows. If you’ve got Perl installed on …
The tutor explains a few details about yesterday’s program. The program, with the while loop and its support code added in orange, is as follows: #!/usr/bin/perl %maritimecapitals=(‘NB’,’Fredericton’,’NS’,’Halifax’,’PEI’,’Charlottetown’); $prov = ‘Y’; while($prov ne ‘X’ && $prov ne ‘x’){ print “Hello. Which …
Perl: some explanation of yesterday’s while loop Read more »
This application of the while loop has been long coming. Yesterday’s program, in which the user can indicate a Maritime province and be told its capital, has one drawback: it exits after giving the answer. What if the user wants …
The tutor asks, “Will the real hash please stand up?” I’ve been hearing about hashtags for a few years now. At first, I wondered why people were suddenly showing much interest in data structures. A data structure is a way …
The tutor returns to the perl sort function. Back in my post on November 27 I introduced a perl program that finds the median of a list of numbers. It depends on perl’s built-in sort function to put the numbers …
Perl: alphabetizing a list of command line arguments Read more »
The tutor follows up on an issue that evolved with the ASCII bell character, ‘\a’, a few posts ago. Back on January 29 I introduced a Perl program that takes, as input, a waiting time in seconds, then makes three …
To the tutor’s mind, Perl code is so easy to write, with so many neat functions, it’s a great teaching language. Today we’ll have some fun. I’ve heard that some people don’t like programming in Perl. I just can’t see …
Continuing with Perl programming, the tutor discusses a couple of simple yet important functions: chop and chomp. Back in my Nov 19 post, I mentioned the Perl function chop. In that case, chop was used to strip the newline off …