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CS 476/576
Systems Programming
Fall 2006
Final Exam
Time 2 & 1/2 hours
Open Book & Notes

 

 

 

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Please do NOT have any include statements in your code.

Please be concise and avoid any extraneous or unneeded statements in your code.

 

Question 1: (30 points)

Your programs in this question should be a bare-minimum; you will be penalized for having any extra unneeded statements. In addition, do not have: include statements, error checking statements.

  1. Write a C program that creates a TCP server socket, bind it to any free port, and display the assigned port and then exits. [10 points]

Solution:

 

 

  1. Repeat A.  using Java [10 points]

Solution:


 

  1. Repeat A. (using C) for UDP. [5 points, show modification  of A. only ]

Solution:

 

 

 

 

 

 

 

 

 

 

  1. Repeat B. (using Java) for UDP  [5 points, show modification  of B. only]

Solution:

 

 

 

Question 2: (35 points)

Write a Java/Swing program that creates a N2 buttons labeled as:

                  1, …,  N2

arranged as  NxN grid and the background of each is green.

When the user clicks on any button (I, J) all buttons in row I and all buttons in column J are disabled and their background changes to red.  When all buttons are disabled a confirm dialog box appears for the user to quit or restart. If the user chose not to quit, the interface is restored back to its initial state. The default value of N is 10 and it may be changed by specifying the new value as a command line argument.

Exemples:

% java q2

         This creates a 10x10 grid.

% java q2 5

        This creates a 5x5 grid.

Solution (2 dimensional):

 

Or Solution (1 dimensional):

 

Question 3: (35 points)

Write a Java application (not applet) program that creates N threads. Each thread sleeps a random amount of time T <=N seconds, increments an “accumulative” sleep counter by T, and terminates. The last thread to terminate computes and prints the average sleep time among all threads.

The default value of N is 20 and it may be changed by specifying the new value as a command line argument.

Exemples:

% java q3

              The average sleep among the 20 threads: 10.5 seconds.

% java q3 5

             The average sleep among the 5 threads: 2.7 seconds.

Solution: