CS 101 - Introduction to Computing

Fall 2009

Exam 1 Solutions

1. c
2. c
3. b
4. b
5. b
6. a
7. a
8. d
9. c
10. d
11. c
12. a
13. b
14. b
15. c
16. e
17. c
18. a
19. a
20. c

21. World w = new World ();
    Turtle t = new Turtle (w);
    int length;
    
    length = SimpleInput.getIntNumber("Enter length of each side of the squares",
                                      1, 500);
    
    t.setPenColor(Color.red);
    t.turn (90);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    
    t.penUp();
    t.forward(length/2);
    t.penDown();
    
    t.setPenColor(Color.blue);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    t.turn (90);
    t.forward (length);
    
    w.show();
    

22. public static void drawOctadecagon (Turtle t, int len)
    {
     for (int count = 0 ; count < 18 ; count++)
       {
        t.forward (len);
        t.turn (20);   // this is 360/18
       }
    }