In 1996, the itList website enabled users to create a web-based version of traditional web browser bookmarks
Indicate whether the statement is true or false
TRUE
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The virtual memory system supports up to ________ levels of page tables to locate the mappings between virtual pages and page frames.
a) 2 b) 3 c) 4 d) none of the above. The kernel supports an arbitrary number of levels.
The use of computers in education is referred to as computer-assisted instruction (CAI). One problem that develops in CAI environments is student fatigue. This can be eliminated by varying the computer's dialogue to hold the student's attention. Modify the program of Exercise 16.27 so the various comments are printed for each correct answer and each incorrect answer. Correct answer responses:
Very good! Excellent! Nice work! Keep up the good work! Incorrect answer responses: No. Please try again. Wrong. Try once more. Don't give up! No. Keep trying. Use random number generation to choose a number from 1 to 4 that will be used to select an appropriate response to each answer. Use a switch structure to issue the responses.
What is polymorphism?
A. ability to create a new class from an existing class. B. allows a single interface, many implementations or methods for that interface. C. ability to hide the implementation and data from the outside the class. D. All of the above.
The last section of this chapter presented four main rules that characterize updatable views in SQL. The third rule states that if the WHERE clause contains a nested subquery, none of the tables mentioned in that subquery (explicitly or implicitly) can be the table used in the FROM clause of the viewde?nition.
Construct a viewthat violates condition 3 but satis?es conditions 1, 2, and 4 for updatability, such that there is an update to this viewthat has two di?erent translations into the updates on the underlying base relation.