Answers to Practice Final Exam -- Spring 18

Part A: Multiple Choice

 1. b    2. c    3. a    4. b    5. c
 6. d    7. b    8. c    9. c   10. d
11. c   12. b   13. d   14. a   15. d

Part B: Find the Errors

Corrected source code:

# Source code file bridgehand.py

from card import Card
from deck import Deck

class BridgeHand(Deck):

    def __init__(self, the_cards):
        self._cards = [ ]
        for card in the_cards:
            self._cards.append(card)

# To value a bridge hand, add points for each
# honor card, counting each Ace (rank 14) as 4 points,
# each King (rank 13) as 3 points, each Queen (rank 12)
# as 2 points, and each Jack (rank 11) as 1 point.
# Use the dictionary d to do this.

    def point_count( ):
        total_point_count = 0
        d = {14: 4, 13: 3, 12: 2, 11: 1}
        for card in self._cards:
            if card in d:
                total_point_count += d[card.rank]
        return total_point_count

Part C: Predict the output.

The definition of the Book class is missing from the Practice Final.
Here it is:

class Book:

    def __init__(self, the_author, the_title):
        self.author = the_author
        self.title = the_title

    def __str__(self):
        return f"{self.author}\n{self.title}\n"

Here is the output;

War and Peace 
Tolstoy

Catcher in the Rye
Salinger
813.54
False

True
False

Part D: Construct Unit Test File

Unit test file:

from book import Book
from librarybook import LibraryBook
import unittest
class MyUnitTestClass(unittest.TestCase):

    def test_1(self):
        b1 = Book("Tolstoy", "War and Peace")
        self.assertEqual("Tolstoy\nWar and Peace\n", str(b1))
        self.assertEqual("Tolstoy", b1.author)
        self.assertEqual("War and Peace", b1.title)
        
    def test_2(self):
        b2 = LibraryBook("Salinger", "Catcher in the Rye", 813.54)
        self.assertEqual(
            "Salinger\nCatcher in the Rye\n813.54\nFalse\n", str(b2))
        self.assertEqual(813.54, b2.catalog_number)
        self.assertEqual(False, b2.checked_out( ))
        b2.check_out( )
        self.assertEqual(True, b2.checked_out( ))
        b2.check_in( )
        self.assertEqual(False, b2.checked_out( ))

if __name__ == '__main__':
    unittest.main( )         
    
Part E: Correct the errors

There are the corrected files:

public class Card 
{     
    public int rank;     
    public String suit;     
    public Card(int theRank, String theSuit)     
    {         
        rank = theRank;         
        suit = theSuit;     
    }
    
    public String color( )     
    {         
        // Use equals method to compare String          
        // objects instead of ==.  || means or in Java.         
        
        if (suit.equals("C") || suit.equals("S"))        
        {             
            return "black";         
        }         
        else         
        {             
            return "red";         
        }     
    }     
    
    // Represent card as a string.     
    // The symbols list entries "0" and "1" are dummy entries.     
    public String toString( )     
    {         
        String[ ] symbols = {"0", "1", "2", "3", "4", "5", "6", "7",                 
            "8", "9", "10", "J", "Q", "K", "A"};         
        return symbols[rank] + suit;     
    } 
} 

public class TestCard 
{     
    public static void main(String[ ] args)     
    {         
        Card c1 = new Card(12, "S");         
        System.out.println(c1.toString( ));         
        System.out.println(c1.rank + " " + c1.suit + " " + c1.color( ));         
        System.out.println( );         
        Card c2 = new Card(14, "H");         
        System.out.println(c2);         
        System.out.println(c2.rank + " " + c2.suit + " " + c2.color( ));     
    }
}