#!/user/bin/perl -w
use strict;

# ------------------------------------------------------------------ 
# File name: buggy.pl
#
# This short Perl code contains a number of intentional bugs. Correct
# them with the help of the error messages.
#
# Version: 2.1
# Authors: H. Kocak and B. Koc, University of Miami
# References:
# https://en.wikipedia.org/wiki/Software_bug
# ------------------------------------------------------------------ 

my $human genes = 20000

my $protein_name = "GFP;

print "Humans have approximately human_genes genes\n";
print $protein_name" stands for green fluorescent protein\n";