The reason why I told him to use variable $a is because his entire program is only 4 lines long. Anybody looking at it can figure out what it is doing and why. And I think, it is logical, since he wanted to store the value of ASCII character "A" in a variable named $alpha. You know, you might as well store it in $a. This was by no means a suggestion that it is a good practice or that we should all do this.
I also have MS-DOS installed on my computer with Perl 5.004. So, I also test my programs on that earlier perl to see what works and what doesn't just for fun. And if all I have to do is change some minor things in my code, then I rather do that to make sure my code is backward compatible. I like when a program runs on as many computers as possible and on as many versions of perl as possible.
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