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Test your basic knowledge |
Perl Programming
Start Test
Study First
Subject
:
it-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Assignment of hash variables in perl (when oringally defining the hash)
string manipulation functions
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
print(FILEHANDLE "Data to outputn");
newline
2. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
basic binding operators
lcfirst($string)
hash functions
unshift(@array, $newValue)
3. Split string into an array using spaces as delimeter
basic binding operators
similar data types
split(/\s/, $string)
scalar
4. The use of "if" "if-else" and "if-elsif-else"
unshift(@array, $newValue)
flow-control
length($string)
like functions
5. _________ @arrayName) returns the size of the array
scalar
@ARGV
interpreter
keys(%hash)
6. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
$line=<FILEHANDLE>
Assignment
hash functions
arithmetic comparison operators
7. The two phases of creating a PERL program _______ - Execution
$line=<FILEHANDLE>
use moduleName; Ex: use Roman;
Editing
(@array)
8. Sort and array alphabetically
sort(@array)
Hash variables
split(/\s/, $string)
uc($string)
9. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
command substitution
@ARGV
$line=<FILEHANDLE>
Expression character classes
10. Returns all of the values of the hash as an array
(@array)
Hash variables
values(%hash)
Special array
11. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
Special array
array functions
scalar
@entireFile=<FILEHANDLE>
12. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
system() function
system commands
foreach
@arrayName size
13. The three basic ________ of the open() function: > write - >> append - < read file
access modes
exists($hashName{keyName})
Array variables
@ARGV
14. Returns a copy of the string with the first letter upper case
Expression character classes
length($string)
join(':', @array)
ucfirst($string)
15. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
each(%hash)
flow-control
interpreter
FILEHANDLE
16. Returns all of the keys of the hash as an array
Editing
FILEHANDLE
Special array
keys(%hash)
17. scalar(@arrayName) returns the ______ of the array names
Editing
access modes
command substitution
@arrayName size
18. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
reverse(%hashName)
scalar
Variable context
%ENV hash array
19. Assignment of a hash variable for a single hash element
FILEHANDLE
push(@array, $newValue)
sort(@array)
$hashName{keyName}="Value to Add"
20. To write to a filehandle
print(FILEHANDLE "Data to outputn");
Hash variables
Scalar variables
size string comparison operators
21. Remove trailing newline from each element in the array
%ENV hash array
chomp(@string)
lcfirst($string)
lc($string)
22. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
@ARGV
@entireFile=<FILEHANDLE>
%ENV hash array
array functions
23. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
substr($string, $startindex, $numchars)
$line=<FILEHANDLE>
string manipulation functions
basic binding operators
24. Stores information about the current users environment. You can print this from the command line using printenv
unshift(@array, $newValue)
join(':', @array)
array functions
%ENV hash array
25. Delete the hash entry with the key given
Special array
delete($hashName{key})
similar data types
scalar context (Ex: $myArray[4] = 2)
26. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
unshift(@array, $newValue)
flow-control
Array variables
keys(%hash)
27. Add a new element to the from of the array with the value $newwValue
use moduleName; Ex: use Roman;
unshift(@array, $newValue)
last index
exists($hashName{keyName})
28. Join the elements of the array seperating the elements with the ':' character
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
29. Returns a copy of the string with the first letter lower case
print(FILEHANDLE "Data to outputn");
Expression character classes
lcfirst($string)
scalar
30. eq - ne - lt - le - gt - ge
scalar
size string comparison operators
execution block
sort(@array)
31. The four types of loops in perl: while - until - for - ________
scalar
similar data types
foreach
split(/\s/, $string)
32. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Expression Quantifiers
keys(%hash)
system() function
chomp(@string)
33. Removes the first element of the array shift
(@array)
substr($string, $startindex, $numchars)
command substitution
$hashName{keyName}="Value to Add"
34. The open() statement in perl: open(________, file_mode, "filename.txt")
like functions
lcfirst($string)
$#arrayName
FILEHANDLE
35. In perl the _______ will recognize syntax errors and halt execution BEFORE it begins - and will output statements; it does not understand and the line which it encountered the error on
interpreter
$line=<FILEHANDLE>
flow-control
ucfirst($string)
36. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
values(%hash)
chomp(@string)
comments
$#arrayName
37. Arrays can be assigned or read in _________
use moduleName; Ex: use Roman;
flow-control
scalar context (Ex: $myArray[4] = 2)
interpreter
38. In arrays elements need not be __________
similar data types
execution block
reverse(@array)
last index
39. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
use moduleName; Ex: use Roman;
Assignment
length($string)
scalar
40. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
newline
unshift(@array, $newValue)
scalar context (Ex: $myArray[4] = 2)
flow-control
41. The variable that provides the last index of an array
push(@array, $newValue)
$line=<FILEHANDLE>
@arrayName size
$#arrayName
42. Removes the last element from the array pop
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
comments
(@array)
scalar context (Ex: $myArray[4] = 2)
43. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
interpreter
system commands
reverse(%hashName)
$hashName{keyName}="Value to Add"
44. Returns a copy of the string as all upper case
push(@array, $newValue)
uc($string)
print(FILEHANDLE "Data to outputn");
Assignment
45. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
system commands
substr($string, $startindex, $numchars)
Variable context
execution block
46. Adds a new element to end of the array with value $newValue
push(@array, $newValue)
print(FILEHANDLE "Data to outputn");
$hashName{keyName}="Value to Add"
%ENV hash array
47. Reverses the elements of the array
array functions
Scalar variables
reverse(@array)
length($string)
48. To include modules in perl
lc($string)
ucfirst($string)
@arrayName size
use moduleName; Ex: use Roman;
49. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
Expression character classes
like functions
similar data types
@entireFile=<FILEHANDLE>
50. _________ in perl - An associative array
unshift(@array, $newValue)
Hash variables
push(@array, $newValue)
$hashName{keyName}="Value to Add"
Sorry!:) No result found.
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