CMSI 185
Quiz 1
Answers
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1.  k,d,l,o,i,m,a,n,h,j,f,e,b,g,c

2.  The variable sum is not initialized.
    Should be int sum = 0;
        
    Also, the loop only goes up to 9999,
    Should be <= 10000
    
    Also, the println is inside the loop.
    It should be outside.
    
3.  public class InitialLetterThing {
        public static void main(String[] args) {
            for (String s: args) {
                System.out.print(s.charAt(0));
            }
            System.out.println();
        }
    }
    
4.  public static boolean isLeapYear(int year) {
        if (year < 1582) {
            throw new IllegalArgumentException();
        }
        return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
    }

5.  import javax.swing.JOptionPane;
    public class FuddifierDialog {
        public static void main(String[] args) {
            String s = JOptionPane.showInputDialog("Enter text:");
            JOptionPane.showMessageDialog(null, s.replaceAll("[RrLl]", "w"));
        }
    }
    
6.  public void paint(Graphics g) {
        for (int i = 0; i < NUMBER_OF_SQUARES; i++) {
	    int x = randy.nextInt(WIDTH - SIDE_LENGTH);
	    int y = randy.nextInt(HEIGHT - SIDE_LENGTH);
	    g.fillRect(x, y, SIDE_LENGTH, SIDE_LENGTH);
        }
    }
    
7.  public static int lengthOf3nPlus1(int n) {
        if (n <= 0) {
            throw new IllegalArgumentException();
        }
        int count = 1;
        while (n != 1) {
            n = (n % 2 == 1) ? 3 * n + 1 : n / 2;
            count++;
        }
        return count;
    }