Question 1

In Perl,print;is equivalent to ____.
A)print "$_";
B)print "$";
C)print "_";
D)print "_$";

Accepted Answer

In Perl, "print" without any arguments prints the content of the special variable $_. Therefore, "print;" is equivalent to "print $_;" which is option A.

Question 2

The character sequence ____ quotes all following nonalphanumeric characters until \E is encountered.
A)\u
B)\U
C)\"
D)\Q

Accepted Answer

The \Q and \E characters together tell Perl to "quote" all metacharacters between them. This is similar to putting single quotes around every character, except that it implicitly makes all characters regex-safe regardless of their original meaning.

Question 3

The following example shows a(n)____ variable: %animals = ('Tigers',10,'Lions',20,'Bears',30);
A)array
B)scalar
C)hash
D)string

Accepted Answer

The variable %animals is a hash, as it uses key-value pairs to store data. Each key (e.g. 'Tigers', 'Lions', 'Bears') is associated with a value (e.g. 10, 20, 30). The % symbol at the beginning of the variable name indicates that it is a hash.

Question 4

The character sequence ____ forces the next character to uppercase.
A)\u
B)\U
C)\"
D)\Q

Accepted Answer

The character sequence \u forces the next character to uppercase.

Question 5

Scalar variable names begin with a(n)____.
A)dollar sign ($)
B)asterisk (*)
C)pound sign (#)
D)exclamation sign (!)

Accepted Answer

Scalar variable names begin with a dollar sign ($).

Question 6

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

Accepted Answer

The .pl extension is typically used for Perl scripts, not .pe.

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

Accepted Answer

The option "-f" is used to specify a file containing the Awk program. If this option is not included, the first command-line argument is used as the program. The other options listed (-I, -i, -F) have different purposes and would not be used in this scenario.

Question 8

The convention is to use all uppercase letters for ____.
A)variables
B)constants
C)strings
D)filehandles

Accepted Answer

The answer of The convention is to use all uppercase...

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

Accepted Answer

Arrays are variables that store an ordered list of scalar values that are accessed with numeric subscripts, starting at zero. Strings are variables that store scalar values as text, Lists are variables that stores an ordered collection of scalars indexed by a unique string key, and Hashes are variables that store an unordered collection of key-value pairs.

Question 10

A(n)____ is a simple variable that holds a number or a string.
A)label
B)constant
C)scalar
D)identifier

Accepted Answer

A scalar is a simple variable that can hold a single value, such as a number or a string. Labels are used to name a section of code, constants are variables with fixed values, and an identifier is a name given to a variable, function, or other code element.

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

Accepted Answer

Perl is an interpreted language which means that the code is executed directly without the need for a separate compilation step. This allows for quicker development and testing of code, but can also result in slower execution compared to compiled languages.

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

Accepted Answer

In Perl, to access a single element of a hash, you use the $ character followed by the hash name and the key associated with the value enclosed in curly brackets.

Question 13

All complete statements in Perl end with a(n)____.
A)colon
B)semicolon
C)comma
D)asterisk

Accepted Answer

All complete statements in Perl end with a semicolon.

Question 14

When processing the individual elements of an array,use the ____ character.
A)@
B)#
C)$
D)*

Accepted Answer

The $ character is used in many programming languages, such as Perl and PHP, to denote scalar variables, which can include individual elements of an array.

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

Accepted Answer

Scalars are single values and cannot be sequences. Variables and constants can hold any type of value, not just sequences of characters.

Question 16

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

Accepted Answer

This is true. Variables can be assigned new values, either by the user or through the program's logic, as the program runs.

Question 17

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

Accepted Answer

Awk is primarily known for its text processing capabilities and is not commonly used as a CGI tool for Web-based applications. CGI tools are typically written in languages like Perl, Python, or PHP.

Question 18

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

Accepted Answer

Awk has built-in looping structures that eliminate the need for the programmer to explicitly set up loops as in Perl or other programming languages.

Question 19

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

Accepted Answer

This statement is false. Double-quoted strings in Perl are subject to interpolation. It means that any variable or expression inside the double quotes will be evaluated and the result will be included in the string.

Question 20

A(n)____ is a variable that represents a set of key-value pairs.
A)string
B)array
C)tuple
D)hash

Accepted Answer

A hash is a data structure that represents a set of key-value pairs. It allows for efficient retrieval of data based on the key, making it a good choice for applications that require fast lookups. Strings, arrays, and tuples also represent data structures, but they do not necessarily involve key-value pairs.

Quiz 9: Perl and Cgi Programming

In Perl,print;is equivalent to ____.

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

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

The character sequence ____ forces the next character to uppercase.

Scalar variable names begin with a(n) ____.

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

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

The convention is to use all uppercase letters for ____.

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

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

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

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 ____.

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

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

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

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

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

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

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

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