I am trying to print out individual elements of a array using printf, this is what I have:
printf("\nCard %d: %s\t%d\t%s\t%s\n ", cardNum,card[0],card[1],card[2],card[3]) This doesn't really work, well, sort of, it gives me an error like this:
undefined method `[]' for nil:NilClass (NoMethodError) I am really confused on how to do this Ruby, Googled for a while but still couldn't figure out...
Thanks in advance!
This has nothing to do with printf at all. You are calling the [] method on the object referenced by the variable card, but that object is the nil object which doesn't have a [] method.
In other words: cards isn't an array at all, it is nil.
printf is the traditional C way of doing this, but there's a shorthand that's more convenient:
card = %w[ KD 2C 4D 9S ] card_num = 1 puts "\nCard %d: %s\t%s\t%s\t%s\n " % [ card_num ] + card But even better:
puts "\nCard %d: %s\t%s\n " % [ card_num, card.join("\t") ] The error you're getting relates to card being nil, which usually means it's undefined.
