Which of the following statements about fiber-optic cabling is accurate?
a. Fiber-optic cabling has a low resistance to signal noise.
b. Light experiences virtually no resistance when traveling through glass.
c. Fiber-optic cable is cheaper than shielded twisted pair cabling.
d. The maximum length for a fiber segment is 20km.
ANSWER: b
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Which of the following is an invalid definition?
a. string sa = "computers"; b. string sb( "computers" ); c. string sc( 'c' ); d. string sd( 9, 'c' );
Write and run a simple shell script named echomyvar that displays the PID (Sobell, page 480) of the process running the script and value of the variable named myvar. Display the PID of the interactive shell you are working with. What is the value of the variable within the process running the shell script? Are the interactive shell and the shell running the script run by the same or different processes (do they have the same PID)?
$ cat echomyvar echo The PID of this process is $$ echo The value of myvar is: $myvar $ echo $$ 2651 $ ./echomyvar The PID of this process is 4392 The value of myvar is:
With _____________ , new classes of objects are derived by absorbing characteristics of existing classes, then adding unique characteristics of their own.
Fill in the blank(s) with the appropriate word(s).
A string is stored as an array of characters terminated by a special end-of-string marker called ____.
A. the newline character B. the NULL character C. a sentinel D. an end-of-file character