The tutor suggests an explanation for the surprise during the Linux test run. In my previous article I reported a surprising finding of how my Java Scanner program reads dollar sign input from the bash command line. Pursuant to …
Java Scanner Linux test run: dollar sign command line arguments Read more »
Continued coverage of the Java Scanner example, this time run on Linux. To find the start of this thread, along with the source code of my Java Scanner example, see my post here. I discuss a test run on Windows …
The tutor continues discussing yesterday’s Java Scanner example. In yesterday’s post I introduced a short program to test an instance of the Java Scanner. As of today, I’ve tried the program on both my Windows and my Linux systems. …
Due to popular demand, the tutor shows basic use of a Java Scanner. I write Java programs for my own needs; I’m not a professional programmer. The following simple Java program illustrates a basic way a scanner can be tested. …
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 has wanted to place a greeting at the top of the Windows terminal (aka command prompt screen). Now you can too. I heard about batch files – and saw files with the .bat extension – in the late …
Windows: a little batch programming towards a friendly greeting Read more »
In this post, the tutor speaks from experience, rather than formal education. Event programming (aka, event-driven programming), as I understand, focuses on designing interfaces that react to user input. What happens when the user clicks a button? What happens when …
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 »