I rewrote this fairly quickly, putting comments inline. It works, but the thing to consider is that a lot of the changes were stylistic changes. Other monks may have cleaner/better solutions.
#!/usr/bin/perl -w
use strict;
my $in = (); # usr input
my $exit = 'n'; # done yet?
my %acro = (
'HTML' => "Hypertext Markup Language",
'ICBM' => "Intercontinental Ballistic Missile",
'EEPROM' => "Electronically-erasable programmable read only memory
+",
'SCUBA' => "Self Contained Underwater Breathing Aparatus",
'FAQ' => "Frequently Asked Questions",
'LCARS' => "Library Computer And Retrieval System",
'NASA' => "National Aeronautical and Space Administration"
);
# I personally don't like empty conditions on
# while loops. This changed the logic a bit, so
# I changed the exit prompt as well.
while ($exit !~ /^y/i) {
print "\nPlease enter an acronym: ";
chomp($in = <STDIN>);
print "\n";
# I'm lazy, and don't want to worry about entering
# uppercase acronyms. The uc() changes input to
# uppercase automagically. Also, this approach
# doesn't loop over every key every time. That's
# what a hash is best for -- so you don't have to loop
# over everything.
if (exists $acro{uc($in)})
{
# No need to assign to a temp variable, btw.
print "$in is the acronym for ", $acro{uc($in)}, " \n\n";
}
else
{
# I also echo input so if the user mistyped the acronym they
# may see the error.
print "Sorry. But $in is not an acronym that I recognize!\n";
}
print "\nFinished? ";
# Your original script didn't have any way to input $exit, so
# it went into an infinite loop (I am guessing that was a
# transcription error)
chomp($exit = <STDIN>);
}
Ask if any of this doesn't make sense.
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