Deck 9: Perl and Cgi Programming

Question 1

In Perl,print;is equivalent to ____.

A)print "$_";
B)print "$";
C)print "_";
D)print "_$";

Answer 1

A

Question 2

The character sequence ____ quotes all following nonalphanumeric characters until \E is encountered.

A)\u
B)\U
C)\"
D)\Q

Answer 2

D

Question 3

The following example shows a(n)____ variable: %animals = ('Tigers',10,'Lions',20,'Bears',30);

A)array
B)scalar
C)hash
D)string

Answer 3

C

Question 4

The character sequence ____ forces the next character to uppercase.

A)\u
B)\U
C)\"
D)\Q

Question 5

Scalar variable names begin with a(n)____.

A)dollar sign ($)
B)asterisk (*)
C)pound sign (#)
D)exclamation sign (!)

Question 6

The .pe extension is typically used to indicate that the file is a Perl script.

Question 7

If the ____ option is not included,the Awk program uses the first command-line argument as its program.

A)-I
B)-i
C)-F
D)-f

Question 8

The convention is to use all uppercase letters for ____.

A)variables
B)constants
C)strings
D)filehandles

Question 9

____ are variables that store an ordered list of scalar values that are accessed with numeric subscripts,starting at zero.

A)Strings
B)Arrays
C)Lists
D)Hashes

Question 10

A(n)____ is a simple variable that holds a number or a string.

A)label
B)constant
C)scalar
D)identifier

Question 11

Perl is a(n)____ language,which means that statements are read and immediately executed.

A)interpreted
B)object-oriented
C)compiled
D)fourth generation

Question 12

To refer to a single element of a hash,you use the $ character before the variable name,followed by the key associated with the value in ____.

A)parentheses
B)curly brackets
C)square brackets
D)angle brackets

Question 13

All complete statements in Perl end with a(n)____.

A)colon
B)semicolon
C)comma
D)asterisk

Question 14

When processing the individual elements of an array,use the ____ character.

A)@
B)#
C)$
D)*

Question 15

____ are sequences of any types of characters (including numbers that are treated as characters rather than digits).

A)Scalars
B)Strings
C)Variables
D)Constants

Question 16

The value of a variable can change while a program runs.

Question 17

Awk is popular as a CGI tool for Web-based applications.

Question 18

The Awk program does not require the programmer to explicitly set up looping structures as does Perl.

Question 19

In Perl,double-quoted strings are not subject to interpolation.

Question 20

A(n)____ is a variable that represents a set of key-value pairs.

A)string
B)array
C)tuple
D)hash

Question 21

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
a variable in Perl

Question 22

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
used to perform a line feed

Question 23

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
in Perl,precedes a hash variable,when it is assigned values

Question 24

The <> symbol is called the ____________________ operator.

Question 25

You can create a Web page using ____________________ (HTML).

Question 26

In HTML,all special codes contained inside angled brackets <> are ____.

A)commands
B)constants
C)tags
D)variables

Question 27

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
in Perl,when it precedes a variable name,it indicates it should not be interpolated

Question 28

____________________ Language (Perl)is a free script language that runs on many operating systems,including UNIX,Linux,Windows,and Mac OS X.

Question 29

The name of the computer at the loopback address is ____.

A)localhost
B)host
C)default
D)root

Question 30

After you create a Web page,you can publish the page on a Web ____.

A)program
B)database
C)server
D)client

Question 31

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
marks the beginning of a comment in Perl

Question 32

The <=> sort operator,known as the ____________________ operator,reduces coding requirements.

Question 33

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
in Perl,tests two numeric values for equality

Question 34

____________________ are symbolic names that represent values stored in memory.

Question 35

The IP address ____ is the standard designation for loopback communications.

A)192.168.0.1
B)10.0.0.0
C)255.255.255.255
D)127.0.0.1

Question 36

In Perl,the logical OR operator is ____.

A)<>
B)<=>
C)||
D)|

Question 37

The ____ feature allows your UNIX or Linux system to access its own internal network configuration instead of an external network.

A)spaceship
B)loopback
C)netstat
D)ifconfig

Question 38

A(n)____________________ is text or an object that,when clicked,loads another document and displays it in the browser.

Question 39

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
one of Perl's string relational operators

Question 40

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
in Perl,precedes the name of an array when assigning it values

Question 41

What is a compiled language?

Question 42

What is a Web server?

Question 43

What is a floating-point value?

Question 44

What is CGI?

Question 45

What are the two parts of the code of a Web (HTML)page?

Question 46

What is a filehandle?

Question 47

How can you sort @somelist and store the result in @sortedlist?

Question 48

Describe the types of tasks in which Perl is frequently used.

Question 49

What is a subroutine?

Question 50

Match each item with a statement below.
a.\n
f.#
b.$name
g.==
c.@
h.%
d.\
i.ne
e.<>
returns the next line from a file (after it has been opened)

Question 51

How do you read input from the keyboard in Perl?

Question 52

What is a constant?