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Assignment #12 - HTML, Web pages, Style, CSS
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- Ian! D. Allen - idallen@idallen.ca - www.idallen.com

0.  What is the date and room location of your CST8281 Final Exam?

    11:30am-2pm Thursday, April 29, 2010, rooms T102A/B/C

1.  Write the simplest IF statement (simplify the Boolean logic) for the
    following programming problem specification:

    "An order is classified as "stale" if the cost is more than $10 and
     the time is more than 90 days.
     Call the inventory routine if the size is bigger than 10 litres
     and the order is not stale."

    stale = cost > 10 AND time > 90

    NOT stale = NOT ( cost > 10 AND time > 90 )
              = cost <= 10 OR time <= 90

    if ( size > 10 AND NOT stale ) CALL inventory();

    if ( size > 10 AND ( cost <= 10 OR time <= 90 ) ) CALL inventory();

     - the parentheses are required, since AND has precedence

2.  Write the simplest IF statement (simplify the Boolean logic) for the
    following programming problem specification:

    "An order is classified as "urgent" if the cost is more than $10 or
     the time is less than 90 days.
     Call the notify routine if the cost is more than $10 
     and the order is not urgent."

    Find the bug in the above logic.  What is wrong?  As a programmer,
    what would you tell your boss about this specification?

    urgent = cost > 10 OR time < 90

    NOT urgent = NOT ( cost > 10 OR time < 90 )
               = cost <= 10 AND time >= 90

    if ( cost > 10 AND NOT urgent ) CALL notify();

    if ( cost > 10 AND cost <= 10 AND time >= 90 ) CALL notify();

    Observe that "cost > 10 AND cost <= 10" is a case of "A AND NOT A",
    which can never be true.  The notify() routine will never execute.
    The specification is wrong.

3.  Create a new assignment directory "public_html/a12".  What is the
    absolute pathname of this directory on the CLS?

    $ mkdir public_html/a12
    $ cd public_html/a12
    $ pwd
    /home/abcd0001/public_html/a12

Answers 4-13 are all found as files created on the Course Linux Server.

-- 
| Ian! D. Allen  -  idallen@idallen.ca  -  Ottawa, Ontario, Canada
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