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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. scalar(@arrayName) returns the ______ of the array names
@arrayName size
Editing
Hash variables
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
2. Returns a copy of the string with the first letter lower case
(@array)
lcfirst($string)
delete($hashName{key})
chomp($string)
3. _________ $#arrayName give value of last index available in the array. Ex an array of size 5 will have its $#arrayName = 4
reverse(@array)
Special array
use moduleName; Ex: use Roman;
command substitution
4. _________ @arrayName) returns the size of the array
reverse(%hashName)
scalar
Scalar variables
$#arrayName
5. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
hash functions
Editing
push(@array, $newValue)
$#arrayName
6. 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
7. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
scalar
newline
execution block
use moduleName; Ex: use Roman;
8. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
each(%hash)
delete($hashName{key})
string manipulation functions
substr($string, $startindex, $numchars)
9. Split string into an array using spaces as delimeter
hash functions
Variable context
Hash variables
split(/\s/, $string)
10. Assignment of hash variables in perl (when oringally defining the hash)
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
Variable context
similar data types
length($string)
11. Returns a copy of the string as all upper case
uc($string)
hash functions
Array variables
last index
12. Common ___________: substr($string, $start, $numchars); - length($string) - lc($string) - uc($string) - chomp($string) - chomp(@string) - join(':", @string) - split(/\s/, $string) - lcfirst($string) - ucfirst($string)
command substitution
uc($string)
Variable context
string manipulation functions
13. Adds a new element to end of the array with value $newValue
size string comparison operators
array functions
command substitution
push(@array, $newValue)
14. Sort and array alphabetically
%ENV hash array
sort(@array)
basic binding operators
comments
15. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
Array variables
Editing
last index
execution block
16. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
print(FILEHANDLE "Data to outputn");
(@array)
each(%hash)
command substitution
17. _________ in perl - An associative array
Hash variables
keys(%hash)
string manipulation functions
like functions
18. Removes the last element from the array pop
(@array)
reverse(@array)
hash functions
ucfirst($string)
19. In arrays elements need not be __________
scalar context (Ex: $myArray[4] = 2)
similar data types
last index
Scalar variables
20. Returns a copy of the string with the first letter upper case
Variable context
@entireFile=<FILEHANDLE>
delete($hashName{key})
ucfirst($string)
21. Common ________: pop(@array) - push(@array, $new Value) - shift(@array) - unshift(@array, $newValue) - sort(@array) - reverse(@array)
delete($hashName{key})
Expression Quantifiers
lc($string)
array functions
22. The four types of loops in perl: while - until - for - ________
interpreter
foreach
(@array)
system() function
23. Swap keys for values and values for keys. Will cause issues if there are multiple hash entries with the same value
Expression Quantifiers
reverse(%hashName)
Assignment
similar data types
24. Removes the first element of the array shift
(@array)
delete($hashName{key})
$#arrayName
each(%hash)
25. Regular ____________: w - alphanumeric word including underscor - d - digits 0-9 - s any whitespace - . - any character
print(FILEHANDLE "Data to outputn");
scalar context (Ex: $myArray[4] = 2)
Expression character classes
newline
26. Returns all of the keys of the hash as an array
Array variables
keys(%hash)
lc($string)
like functions
27. A special system variable used to pass arguments to script
Variable context
Hash variables
@ARGV
$#arrayName
28. Modules in perl - Synonymous with header files in C - Collection of ______ and variables that may be used in your program
execution block
like functions
last index
arithmetic comparison operators
29. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
system() function
each(%hash)
size string comparison operators
basic binding operators
30. Arrays can be assigned or read in _________
scalar context (Ex: $myArray[4] = 2)
access modes
$hashName{keyName}="Value to Add"
@arrayName size
31. Returns all of the values of the hash as an array
values(%hash)
arithmetic comparison operators
size string comparison operators
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
32. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
command substitution
Special array
exists($hashName{keyName})
substr($string, $startindex, $numchars)
33. Stores information about the current users environment. You can print this from the command line using printenv
%ENV hash array
basic binding operators
Array variables
scalar context (Ex: $myArray[4] = 2)
34. Returns the length of the string including escape sequences
uc($string)
Array variables
length($string)
reverse(%hashName)
35. The use of "if" "if-else" and "if-elsif-else"
flow-control
values(%hash)
similar data types
unshift(@array, $newValue)
36. Removes trailing newline
interpreter
chomp($string)
foreach
split(/\s/, $string)
37. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
join(':', @array)
comments
Variable context
Expression Quantifiers
38. To include modules in perl
use moduleName; Ex: use Roman;
system commands
@entireFile=<FILEHANDLE>
Variable context
39. Delete the hash entry with the key given
delete($hashName{key})
$#arrayName
$line=<FILEHANDLE>
@arrayName size
40. Assignment of a hash variable for a single hash element
$hashName{keyName}="Value to Add"
Expression Quantifiers
@entireFile=<FILEHANDLE>
flow-control
41. Add a new element to the from of the array with the value $newwValue
keys(%hash)
Expression Quantifiers
newline
unshift(@array, $newValue)
42. The variable that provides the last index of an array
string manipulation functions
@entireFile=<FILEHANDLE>
(@array)
$#arrayName
43. _________ in perl - Singular variable - starts with "$" - Number or characer or string- Perl does automatic type conversion of these
comments
Scalar variables
values(%hash)
foreach
44. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
%ENV hash array
system commands
Expression Quantifiers
length($string)
45. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
comments
command substitution
Assignment
keys(%hash)
46. The two phases of creating a PERL program _______ - Execution
length($string)
ucfirst($string)
Editing
unshift(@array, $newValue)
47. The three basic ________ of the open() function: > write - >> append - < read file
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
access modes
Array variables
keys(%hash)
48. Returns a copy of the string as all lower case
chomp($string)
lc($string)
exists($hashName{keyName})
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
49. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
sort(@array)
comments
Variable context
lc($string)
50. < - > - == - <= - >= - !=
Expression Quantifiers
push(@array, $newValue)
arithmetic comparison operators
execution block
Can you answer 50 questions in 15 minutes?
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