CISC181 Possible Exam Questions
P. Conrad, CISC Dept., Univ. of Delaware

This file contains exam questions that occur to me at various times. Whether these questions are appropriate for any particular exam (say, Midterm 1, Midterm 2, or the Final) may vary from semester to semester, depending on the sequence of topics covered. If you are not sure about the answer to a question, or whether it would be considered fair game for a particular exam in a particular semester, ask me.

I've marked some questions with a notation such as (E02_F04). The notation E02_F04 indicates, for example, that the question could appear in the Fall semester of 2004, on the second exam, or any exam after that (including the final exam). E03_F04 would indicate questions that would only appear on the third exam in Fall 2004 (i.e. the final exam.) E01_S05 would indicate Spring 2005, starting with the first exam (meaning the question could appear on any of the exams that semester.)

1. (E02_F04). Professor Shirley Wright, who teaches CISC181 at Wassamatta University (a.k.a Wassamatta U.) put the following question on her CISC181 exam.
   • What is printed by the following segment of C++ code:

     cout << 0xFABC424B % 4 << endl;

   Note that Prof. Wright does not permit her students to use a calculator on exams.

   One or Prof. Wright's students, a Mr. B.C. Dull told his roomate "That lady is crazy! How does she expect us to be able to do a calculation on such a huge hexadecimal number without using a calculator?"
   
   However, B.C. Dull's roomate, Terry Bly Smart answered Mr. Dull:
   "Chill out dude. You don't need a calculator to answer this problem. You can look at the last hexadecimal digit, the 'b', and tell right away what the answer is.".
   
   Who is correct, B.C.Dull, or T.B.Smart? Explain your answer.

2. (E02_F04) What is the output?
   
   cout << 0xFABC424B % 4 << endl;
cout << 0xFABC424E % 2 << endl;
cout << 0xC7FA1937 % 8 << endl;

3. (E02_F04) The following box shows a script of a series of Unix commands on Strauss, with two parts of the actual output replaced by ??????????, and ##########.
   
   • Instead of ??????????, the actual output would be (multiple choice):
1. -rw-------
2. -rwx------
3. -rwxr-xr--
4. -rw-r-----
   
• Instead of ##########, the actual output would be (multiple choice):
1. -rw-------
2. -rwx------
3. -rwxr-xr--
4. -rw-r-----
• Convert 640 and 754 from octal to binary, and explain how this relates to your answers to the previous two multiple choice questions.
  

> ls -l total 16 -rw------- 1 pconrad 2017 180 Oct 10 16:03 lab00.cc -rwx------ 1 pconrad 2017 830 Oct 10 16:03 lab01a.cc > chmod 640 lab00.cc > chmod 754 lab01a.cc > ls -l total 16 ?????????? 1 pconrad 2017 180 Oct 10 16:03 lab00.cc ########## 1 pconrad 2017 830 Oct 10 16:03 lab01a.cc >