In the accompanying figure, why is most of the image filled with gray?
A. The filter removes everything but the midtones.
B. Only the edge pixels are visible.
C. The gray represents the edges of the image.
D. None of the above.
Answer: B
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When composition (one object having another object as a member) is used:
a. The host object is constructed first and then the member objects are placed into it. b. Member objects are constructed first, in the order they appear in the host constructor’s initializer list. c. Member objects are constructed first, in the order they are declared in the host’s class. d. Member objects are destructed last, in the order they are declared in the host’s class.
Fill in the missing event that causes deadlock in a database. There are two processes (P1 and P2), each of which needs to update two records (R1 and R2) and the following sequence leads to a deadlock:1. P1 accesses R1 and locks it.2. P2 accesses R2 and locks it.3. ____4. P2 requests R1, which is locked by P1.
A. P2 releases R2. B. P1 requests R1 again. C. P1 requests R2, which is locked by P2. D. P2 releases R1.