my $text;
my $type;

# This section grabs the text from the user and converts to lower case.
print "Please enter the text you would like to encrypt:";
chomp($text = <STDIN>);
$text =~ tr/A-Z/a-z/;

# This section lets you pick the type of encryption you would like to use.
print "Please enter c for Caesar or r for ROT13 encryption: ";
chomp($type = <STDIN>);
$type =~ tr/A-Z/a-z/;

# This section uses the encryption you chose.
if ($type eq c) {
	$text =~ tr/c-za-b/a-z/;
}
if ($type eq r) {
	$text =~ tr/n-za-m/a-z/;
}
print $text;