Which of the following statements is false?
a. In the UML, each class is modeled in a class diagram as a rectangle with three compartments. The top one contains the class’s name centered horizontally in boldface. The middle one contains the class’s attributes, which correspond to instance variables in Java. The bottom one contains the class’s operations, which correspond to methods and constructors in Java.
b. UML represents instance variables as an attribute name, followed by a colon and the type.
c. Private attributes are preceded by the keyword private in the UML.
d. The UML models operations by listing the operation name followed by a set of parentheses. A plus sign (+) in front of the operation name indicates that the operation is a public.
C
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Create a list of IDs you have that could be considered primary keys in a database.
What will be an ideal response?
Experiment with the Hello CGI example presesnted in Figures 9.10 and Figure 9.11.
a. Obtain the source files for the Hello CGI example presesnted in Figures 9.10 and Figure 9.11. b. Install hello.html on the web server: be sure to open its access to world-readable. c. Compile hello.c (with util.c for the query-string processing routines) to generate an executable Hello.cgi. (The command is%gcc hello.c util.c -o hello.cgi). Install hello.cgi on the web server: be sure to open its access to world-readable and world-executable. d. Open a browser and specify the URL for hello.html. When the page is displayed, press the button to submit the form and invoke hello.cgi. e. Summarize the experiment and report the result.
When you create a password, use a password that is at least ____ characters long.
A. six B. seven C. eight D. eleven
When extending the range for a 2.4-GHz WLAN, you can use non-overlapping channels for adjacent coverage cells. However, there should be some overlap in coverage between those cells (using non-overlapping channels) to prevent a connection from dropping as a user roams from one coverage cell to another. What percentage of coverage overlap is recommended for these adjacent cells?
a. 5 percent to 10 percent b. 10 percent to 15 percent c. 15 percent to 20 percent d. 20 percent to 25 percent