Name ___________________

CPTR246 Spring '99 (100 total points) Exam 2

Read the instructions to each question carefully and completely before answering.

  1. What is the output produced by the following code? (5 points)

    2.  
      int x(5);
      int * a;
      a = &x;
      *a = *a + x;
      cout << x << endl;
      cout << *a << endl;
     
  2. Below is a visual representation of an ordered linked list of integers (i.e., a linked list of integers whose values are kept in order from lowest to highest). Indicate the changes that would take place if the following integers were added: 15, 38, 95. (10 points)
                (link list would not display - use example given in class)
 
 
  1. What do the acronyms (initials) FIFO and LIFO stand for? (5 points)

    2. FIFO -

     

    LIFO -

     

     

  2. Suppose you are implementing a stack of integers as a linked list. (10 points)
  1. Draw the visual representation (as was done in question 2) of the stack after the following stack operations are executed. Assume that the stack is empty when you start!

    2.  
      push 5
      push 8
      push 12
      pop
      push 10
      push 4
      pop
     
     
     
  2. What two integers were popped?
  1. Suppose you are implementing a queue of integers as a linked list. (10 points)
    1. Draw the visual representation (as was done in question 2) of the queue after the following queue operations are executed. Assume that the queue is empty when you start!

      2. enqueue 5
      enqueue 8
      enqueue 12
      dequeue
      enqueue 10
      enqueue 4
      dequeue
       
       

    2. What two integers were dequeued?
  1. From the Standard Library Handout, we know that the following functions are available in C++.
 
                (these functions are given in our current textbook on page 325)

 

Using the following object definitions and the given library functions, write C++ code to accomplish the specified tasks.
  char stringA[50];
char stringB[50];
char miniString[4];
  1. Copy the first 5 characters in string stringA to stringB. (Only one statement is necessary). (5 points)

    2.  

     

     

     

  2. Display the message "Substring found" if miniString is a substring of stringA. Otherwise, display "Substring not found". (5 points)
 

 

 

 

 

 

 

  1. What is a memory leak? (5 points)

    2.  

     

     

     

     

     

     

     

     

     

     

     

     

  2. I'm writing a class named CARD and you're writing a class named DECK. In my class declaration, I code

    3.  
      friend class DECK;
    Explain the effect of this line of code. (5 points)

     

     

     

     

     

     

     

     

     

  3. Define ADT (Abstract Data Type). (5 points)

    4.  

     

     

     

     

     

     

  4. You have received a copy of queue.h, the class implementation for a queue. You are to add two new member functions to the class, Size and LineJumper. Each is described below.
  Size - this function will compute and return the number of nodes (elements) in the queue. An example of its use would be:
  Queue myQueue; // define queue object

. . . // code to load the queue

cout << myQueue.Size() << endl;
 

 LineJumper - this function inserts a new node (element) into the queue, but not in the normal position as is done with the Enqueue member function. This function takes as parameters the integer value to be inserted and the position in the queue it is to take. For example, if myQueue contains 6 5 9 2 and the following command is executed
  myQueue.LineJumper(8, 3); then the integer 8 is inserted into the queue and has the third position. The queue would then have 6 5 8 9 2 You may assume that the position is a valid one for line jumping -- that is if the queue currently has n nodes, then the position passed to LineJumper will be a number from 1 to n.

 

 

 

 

 

 

 

 You are to complete the code for these functions on the following two pages. Question 10 (continued …) For the Size member function: (10 points) Code the prototype that would be inserted into the public section:

 

 

 

 

 

Code for the function definition:

Question 10 (continued …)

For the LineJumper member function: (25 points)

Code the prototype that would be inserted into the public section:

 

 

 

 

 

 Code for the function definition:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Please give a 4-digit number, known only to you, that I can use for posting grades: _____