Write an expression that continues to bid until the user enters 'n'. 4 public class AutoBidder { 5 public static void main (String args) { 6 Scanner scnr = new Scanner(System.in): 7 Random randGen = new Random(): 8 char keepGoing = '-': 9 int nextBid = 0: 10 11 randGen. setSeed(5): 12 while () { 13 nextBid = nextBid + (randGen.nextInt(10) + 1): 14 System.out.println("I'll bid $" + nextBid + "!"): 15 System.out.print("Continue bidding? (y) "): 16 keepGoing = scnr.next().charAt(0): 17 } 18 System.out.println(""): 19 20 return: 21 } 22 } Failed to compile AutoBidder.java: 13: char cannot be dereferenced while (keepGoing.matches('n')) {