// Flag_1
// using a flag and a sentinel 
// The user should enter bowling scores. Every time there are two strikes in a row,
// congratulate the user!

import javax.swing.JOptionPane;
public class Flag_1 {
   public static void main( String[] args )
   {
	int get_number = 0;
	int strike = 0;   // start off without a strike
    // Prompt the user to enter a score: 
    String numberString = JOptionPane.showInputDialog(null, 
      "Enter your score for this frame (0-10, 11 for a strike, -1 to exit) ", 
      "Input Number Window", JOptionPane.QUESTION_MESSAGE);
   
    // Convert the string into an int value
    get_number = Integer.parseInt(numberString);

	// use -1 in this case as the sentinel
    while (get_number != (-1) ) {
		if (get_number == 11) { // this is a strike
			System.out.println(" You got a strike!");
		
			// now check the flag used for strike to see if there are two in a row
			if (strike == 1) {
				System.out.println(" That makes two strikes in a row! Congratulations!");
				strike = 0;	}// be sure to set the flag back to 0 or false
			else
				strike = 1; 
			} // end of if this is a strike
		else
			{
			System.out.println(" Your score for this frame is " + get_number + ".");
			strike = 0 ;}

    	// Prompt the user to enter another score: 
       numberString = JOptionPane.showInputDialog(null, 
      "Enter your score for this frame (0-10, 11 for a strike, -1 to exit) ", 
      "Input Number Window", JOptionPane.QUESTION_MESSAGE);
    
 	   // Convert the string into an int value
       get_number = Integer.parseInt(numberString);
		} // end of while loop

      System.exit( 0 );   
   } // end main
} // end of program