Hey, so I'm fairly new to perl and was experimenting with a random number generator and some other things as a sort of intelligence test, long story short, I didn't make it very far. I'd like to ask the user if they accept the challenge, but also have it loop and ask again for user-input if a non-acceptable answer is entered. Here is the segment of my code where the error "Can't call method "untill" without a package or object reference" 

#!usr/bin/perl
use strict;
use warnings;
use diagnostics;
my $range = 100;
my $random_number = int(rand($range));
my $answer = 0;

print "Do you accept this challenge? ";

Do  {
    chomp (my $response = <>);    
    if ($response eq 'yes' || 'Yes' || 'YES' || 'y') {
        $answer = $answer + 1;
} 

    elsif ($response eq 'no' || 'No' || 'NO' || 'n') {
        $answer = $answer + 2;
    
    } else {
        print "Please respond with 'yes' or 'no'\n\n";
    }    
}until $answer > 0;

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In reply to User input check 'Do until' loop by Ahten

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