Scenario You have read a text file containing whitespace
separated columns of numbers. Each line may contain leading and
trailing whitespace. You must iterate through the file and, for
each line, capture the numbers in an array. The elements of the
array must not contain leading or trailing space and there may be
no empty elements. Based on the scenario above, which split command
might you use in your loop to meet the specification? Choice 1 my
@fields = split / /, $string; Choice 2 my @fields = split /\s/,
$string; Choice 3 my @fields = split /\s+/, $string; Choice 4 my
@fields = split ' ', $string; Choice 5 my @fields = split /\s*/,
$string; Perl 5.12, Question 1 of 20 -----------===== Sample Code
$f = 4; for $f (1, 2, 3) { print $f; } print $f; Based on the
sample code above, what is printed? Choice 1 123 Choice 2 4444
Choice 3 1233 Choice 4 1234 Choice 5 Nothing; the script exits with
an error. Perl 5.12, Question 2 of 20
Sample Code $x = (2, 4, 6); Based on the sample code above, what
will $x equal after the assignment? Choice 1 2 Choice 2 3 Choice 3
6 Choice 4 undef Choice 5 An empty string Perl 5.12, Question 3 of
20
What statement would open a file for both reading and writing?
Choice 1 open( my $fh, '>>', $filename ) or die $!; Choice 2
open( my $fh, '', $filename ) or die $!; Choice 3 open( my $fh,
'rw', $filename ) or die $!; Choice 4 open( my $fh, '+',undef) ||
die "Can't open"; Choice 5 open($fh,'>',\$variable) || die
"Can't open" Perl 5.12, Question 20 of 20
What is one important difference between the "use" statement and
the "require" statement?
Choice 1 Use statements can only be used to include modules;
require statements cannot be used to include modules. Choice 2
Require statements can only be used to include modules; use
statements cannot be used to include modules. Choice 3 Use
statements are evaluated at run time; require statements are
evaluated at compile time. Choice 4 Use statements are evaluated at
compile time; require statements are evaluated at run time. Choice
5 Require statements can have an import list; use statements always
import all the symbols exported by the module. Perl 5.12, Question
1 of 20
What do you use to create a class? Choice 1 A package Choice 2 A
hash Choice 3 A subroutine Choice 4 An anonymous hash Choice 5 A
typeglob Perl 5.12, Question 2 of 20 Which statement immediately
exits a loop and continues execution with the first statement
following the loop? Choice 1 exit Choice 2 next Choice 3 last
Choice 4 goto Choice 5 die Perl 5.12, Question 3 of 20
Which items help in writing secure code? Choice 1 Enabling
bounds checking, buffer overflow alerts, and lint checking Choice 2
Enabling profiling Choice 3 Enabling debugging Choice 4 Enabling
the security module with "use Security;" Choice 5 Enabling taint
checking, strict, and warnings Perl 5.12, Question 4 of 20
Sample Code
Based on the sample code above, what is the standard output?
Choice 1 A list of all elements in the environment in sorted order
Choice 2 A list of all elements in the environment in unsorted
order Choice 3 A list of all elements in the environment in the
order in which %ENV's keys were last accessed Choice 4 A stream of
continuous output until the output is manually interrupted Choice 5
A syntax error is produced Perl 5.12, Question 5 of 20
What is returned when a call to system() executes successfully?
Choice 1 -1 Choice 2 0 Choice 3 1 Choice 4
255 Choice 5 The pid of the subprocess. Perl 5.12, Question 6 of
20
Which regular expression deletes all tags specified as text,
enclosed by "", from a document stored in a string, but deletes
nothing else. Choice 1 $string =~ s///sg; Choice 2 $string =~
s///sg; Choice 3 $string =~ s///sg; Choice 4 $string =~ s///sg;
Choice 5 $string =~ s///sg; Perl 5.12, Question 7 of 20
Sample Code
Based on the sample code above, what is the output? Choice 1 1
Choice 2 135 Choice 3 357 Choice 4 11357 Choice 5 13571 Perl 5.12,
Question 8 of 20
Sample Code
Based on the sample code above, what is the output of the code?
Choice 1 20 10 20 Choice 2 20 20 20 Choice 3 30 10 20 Choice 4 30
20 20 Choice 5 30 10 10 Perl 5.12, Question 9 of 20 Which module is
typically used to evaluate unknown or unsafe code within an
optionally operator-restricted namespace? Choice 1 Opcode Choice 2
Taint Choice 3 Safe Choice 4 Overload Choice 5 Sigtrap Perl 5.12,
Question 10 of 20
Sample Code
What does "$data" contain after the code is executed? Choice 1
The empty string Choice 2 The first byte in "file.dat" Choice 3 The
first line in "file.dat" Choice 4 The first page in "file.dat"
Choice 5 The entire file in "file.dat" Perl 5.12, Question 11 of 20
What expression is equivalent to pop(@data)? Choice 1
splice(@data,-1,1) Choice 2 splice(@data,0,1) Choice 3
splice(@data,1,1) Choice 4 splice(@data,-1,0,1); Choice 5
splice(@data,0,0,1); Perl 5.12, Question 12 of 20 What expression
is equivalent to shift(@data)? Choice 1 splice(@data,-1,1) Choice 2
splice(@data,0,1) Choice 3 splice(@data,1,1) Choice 4
splice(@data,-1,0,1); Choice 5 splice(@data,0,0,1); Perl 5.12,
Question 13 of 20
Sample Code undef $/; Based on the code sample above, what is
the effect during input or output? Choice 1 It reads the entire
file. Choice 2 It specifies to Perl not to buffer file output.
Choice 3 It displays a line at a time in output. Choice 4 It reads
a line at a time. Choice 5 It makes later processing case
insensitive. Perl 5.12, Question 14 of 20
What statement would assign to $n the number of elements in the
hash %h? Choice 1 $n = scalar %h; Choice 2 $n = $#h; Choice 3 $n =
count keys %h; Choice 4 $n = scalar keys %h; Choice 5 $n =
count(%h); Perl 5.12, Question 15 of 20
Scenario You need to check to see what version of Perl a module
you have written is running. You know that Perl versions earlier
than 5.005 do not work properly with your module. Based on the
scenario above, how do you check that the version of Perl is new
enough? Choice 1 Using "$PERLVER>=5.005" Choice 2 Using
"$|>=5.005" Choice 3 Using "$$>=5.005" Choice 4 Using
"$]>=5.005" Choice 5
Using "%INC{VERSION}>=5.005" Perl 5.12, Question 16 of 20
Sample Code Based on the sample code above, what prints? Choice
1 11 12 13 Choice 2 1 2 3 Choice 3 1..1 1..2 1..3 Choice 4 1 12 123
Choice 5 1 21 321 Perl 5.12, Question 17 of 20
How do you call a subroutine with a scalar value as an argument?
Choice 1 $subname[$scalar]; Choice 2 $scalar=&subname; Choice 3
$scalar=&subname{}; Choice 4 subname{$scalar}; Choice 5
subname($scalar); Perl 5.12, Question 18 of 20 Which conditional
statement is equivalent to "if (!)"? Choice 1
ifn () Choice 2 fails () Choice 3 unless () Choice 4 failure ()
Choice 5 require () Perl 5.12, Question 19 of 20
Sample Code
Based on the sample code above, in order to produce the total
number of bytes used by all the items in the current directory,
what replaces "????" ? Choice 1 map {my $size = -s $_; my $total +=
$size;} @files; Choice 2 map {my $size = -l $_; $total += $size;}
@files; Choice 3 map {my $size = fsize $_; $total += $size;}
@files; Choice 4 map {$total += -s $_;} @files; Choice 5 map
{$total += fsize($_);} @files; Perl 5.12, Question 20 of 20
