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This nifty trick was invented by Andrew Pimlott
Beginners want to say this:
$salary = 43_000;
print "After your raise, you will make $salary*1.06.\n";
But it doesn't work:
After your raise, you will make 43000*1.06.
Because, of course, expressions aren't evalauted inside of strings.
...or are they?
@s = (1, 4, 9, 16, 25, 36);
print "$s[(2+7-1*3)/2]\n"; # Prints 16
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