Please assist, I'm a biotech grad student trying to learn perl to make my experimental data easier to manipulate. I am writing a very simple program for conversions to start with, but am getting errors: Any help is greatly appreciated! 
my ($value, $from, $to, $prefix, %allprefixes);
%allprefixes = 
(
    "mega"    => 6,  #use these as exponents, so down below I can just
+ subtract exponents to get the answer
    "kilo"    => 3,
    "milli"    => -3,
    "micro"    => -6,
    "nano"    => -9,
    "pico"    => -12,
    "femto"    => -15,
    "atto"    => -18,
    "zepto"    => -21,
    "yocto"    => -24,
);

print "Enter the unit that you are starting with: ";
$from = <STDIN>;
print "Enter your target unit: ";
$to = <STDIN>; 
print "Enter the numerical amount: ";
$value = <STDIN>; 

chomp ($from);
chomp ($to);
chomp ($value);

if (not exists $allprefixes{$to}) {
    die "My programmer has not yet supplied me with $to as a prefix\n"
+;
}
if (not exists $allprefixes{$from}) {
    die "My programmer has not yet supplied me with $from as a prefix\
+n";
}

$prefix = $allprefixes{$to} -- $allprefixes{$from};

print "$value $from is ",$value*$prefix," $to. \n";

[download]

In reply to syntax error at labmonkey.pl line 1, at EOF by theredqueentheory

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.