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A worm sends a clone to 3 computers on the first day, five on the second day and switches off again.
There is a 20% chance that he will find a computer which has an active worm; in this case, nothing happens (whether the worm is active for one or two days).
In 30% of cases the virus scan detects a worm at entry So before he can transmit for the first time).
Of the infected computers, in 50% of cases; the worm will be discovered immediately after the transmission of the first three clones.
Set one or more recurrent relations in order to determine the number of infected computers (a computer worm that has disabled itself is not infected).
- What baseline data do you need for this?
Hint: It is wise to start with a chart/schedule detailing what happens every period and in what order.
Write a function named wordLenghts() that counts the frequency with which words of different lenght occur in an input file.
How do you display the inode number of a file? How do you ensure that all ordinary files created by you have rw-rw---- as the default permissions?
Which processor will execute program C more quickly? At what percentage of complex instructions will the performance of the two processors be equal?
Briefly address the difficulties you think you will face in trying to deal with the five Practical Steps mentioned in Chapter 19.
Explain how functionality and data will be restored and what staff should be involved in the post disaster recovery.
Finalize the class diagram, including all your classes, attributes, primary keys, relationships, and multiplicity constraints.
Identify a major nonverbal behavior in your culture. Consider how someone outside of the culture might react to this nonverbal behavior.
What would you expect the execution time of the program to be in seconds with the new floating-point co-processor?
List and define the four most commonly used attributes for scalar types. List and define an additional four attributes commonly used with discrete types.
What happens when you supply the same name for the input and output files to the Total program? Try it out if you are not sure.
You are a member of SQA group at Ye Olde Fashioned Software. You propose to your manager that inspections be introduced.
What if you include punctuation like periods or hyphens? How could you create more full featured double dutch that gets around these problems?
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