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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. Arrays can be assigned or read in _________
system() function
use moduleName; Ex: use Roman;
scalar context (Ex: $myArray[4] = 2)
chomp($string)
2. _________ in perl - An associative array
array functions
values(%hash)
Assignment
Hash variables
3. Returns the sub string starting at index $startindex and ending after $numchars chars in the string $string
interpreter
newline
substr($string, $startindex, $numchars)
Expression Quantifiers
4. _________ of scalar variables in perl - using "=" - Ex: $myVariable = 5;
Assignment
values(%hash)
similar data types
foreach
5. Add a new element to the from of the array with the value $newwValue
chomp(@string)
unshift(@array, $newValue)
system commands
push(@array, $newValue)
6. A special system variable used to pass arguments to script
system commands
chomp(@string)
execution block
@ARGV
7. In arrays elements need not be __________
foreach
scalar
each(%hash)
similar data types
8. Returns the length of the string including escape sequences
length($string)
newline
reverse(%hashName)
push(@array, $newValue)
9. Join the elements of the array seperating the elements with the ':' character
10. The four types of loops in perl: while - until - for - ________
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
delete($hashName{key})
foreach
@entireFile=<FILEHANDLE>
11. Returns a copy of the string as all lower case
each(%hash)
Editing
lc($string)
comments
12. To get rid of the ________ in $line you could now chomp() (Ex: chomp($line);)
size string comparison operators
print(FILEHANDLE "Data to outputn");
scalar
newline
13. < - > - == - <= - >= - !=
push(@array, $newValue)
join(':', @array)
$hashName{keyName}="Value to Add"
arithmetic comparison operators
14. The open() statement in perl: open(________, file_mode, "filename.txt")
FILEHANDLE
size string comparison operators
(@array)
hash functions
15. Returns all of the values of the hash as an array
similar data types
FILEHANDLE
values(%hash)
print(FILEHANDLE "Data to outputn");
16. Split string into an array using spaces as delimeter
foreach
(@array)
split(/\s/, $string)
reverse(%hashName)
17. _________ @arrayName) returns the size of the array
@entireFile=<FILEHANDLE>
scalar
Special array
@ARGV
18. The purpose of {} in an "if" statement: To Define the __________ of the if statement. Unlike C the {} braces ARE REQUIRED
@entireFile=<FILEHANDLE>
execution block
Assignment
length($string)
19. Common ________: keys(%hash) - values(%hash) - each(%hash) - delete($hash{keyName}) - exists($hash{keyName}) - reverse(%hash)
hash functions
size string comparison operators
similar data types
substr($string, $startindex, $numchars)
20. Explain how to read a line from a file handle
exists($hashName{keyName})
$line=<FILEHANDLE>
FILEHANDLE
%ENV hash array
21. To read an entire file into an array (one line per element)
@arrayName size
FILEHANDLE
lcfirst($string)
@entireFile=<FILEHANDLE>
22. Adds a new element to end of the array with value $newValue
like functions
last index
push(@array, $newValue)
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
23. The use of ______ in perl - Documenting code - Created by placing a "#" on a line. - are not multi-line
Assignment
comments
scalar context (Ex: $myArray[4] = 2)
flow-control
24. The use of "if" "if-else" and "if-elsif-else"
flow-control
push(@array, $newValue)
join(':', @array)
@ARGV
25. The variable that provides the last index of an array
values(%hash)
interpreter
split(/\s/, $string)
$#arrayName
26. Removes the last element from the array pop
(@array)
substr($string, $startindex, $numchars)
Special array
lc($string)
27. Sort and array alphabetically
ucfirst($string)
uc($string)
lc($string)
sort(@array)
28. The _______ in perl: - used to execute an external command - will output results of command to terminal - returns the exit status of the program that ran - use this for commands that you dont care about SAVING the output to a variable
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
sort(@array)
system() function
@arrayName size
29. The two phases of creating a PERL program _______ - Execution
Editing
execution block
Expression character classes
access modes
30. ________ in perl - A collection of data (static data or scalar variables or arrays or hashes can all be stored in an array element)
%ENV hash array
Array variables
Hash variables
delete($hashName{key})
31. The __________ in perl: - uses grave marks `command args`- returns the output of the command to the variable you specify - if $output = `command arg` the output is stored all in one variable (all lines seperated by n) - if @output = `command arg` the
chomp($string)
Expression Quantifiers
execution block
command substitution
32. Two ____________ in regular expressions: =~ Contains - !~ Does not contain
$#arrayName
command substitution
basic binding operators
size string comparison operators
33. Regular __________: * - 0 or more characters - + - 1 or more characters - ? - 0 or 1 characters
Hash variables
Expression Quantifiers
(@array)
unshift(@array, $newValue)
34. The two primary methods of executing _______ in perl: - system("command args") - - `command args`
system commands
split(/\s/, $string)
%ENV hash array
$line=<FILEHANDLE>
35. $#arrayName returns the value of the ______ of the array (NOT the data stored in that array element)
comments
string manipulation functions
last index
basic binding operators
36. Assignment of a hash variable for a single hash element
$hashName{keyName}="Value to Add"
last index
length($string)
flow-control
37. Returns a copy of the string with the first letter lower case
lcfirst($string)
Scalar variables
delete($hashName{key})
foreach
38. Remove trailing newline from each element in the array
exists($hashName{keyName})
Hash variables
chomp(@string)
similar data types
39. To write to a filehandle
print(FILEHANDLE "Data to outputn");
push(@array, $newValue)
substr($string, $startindex, $numchars)
string manipulation functions
40. Does the hash key with "keyName" exists
newline
Expression character classes
exists($hashName{keyName})
use moduleName; Ex: use Roman;
41. Assignment of hash variables in perl (when oringally defining the hash)
size string comparison operators
basic binding operators
%hashname = (key1=>"value1", key2=>"value2", key3=>"Value3")
delete($hashName{key})
42. Returns a copy of the string as all upper case
push(@array, $newValue)
like functions
Expression Quantifiers
uc($string)
43. scalar(@arrayName) returns the ______ of the array names
@arrayName size
@entireFile=<FILEHANDLE>
access modes
flow-control
44. Reverses the elements of the array
%ENV hash array
reverse(@array)
split(/\s/, $string)
sort(@array)
45. Removes the first element of the array shift
delete($hashName{key})
(@array)
command substitution
ucfirst($string)
46. To include modules in perl
Array variables
delete($hashName{key})
scalar
use moduleName; Ex: use Roman;
47. ________ in perl - can be scalar array or hash context - tells the interpreter what you are looking for (Ex: "$arrayname[$index_number]")
join(':', @array)
Variable context
chomp(@string)
$hashName{keyName}="Value to Add"
48. Returns a two element ray of the next key value pair; resultArray[0] is the key resultArray[1] is the value
newline
each(%hash)
@arrayName size
sort(@array)
49. Returns all of the keys of the hash as an array
keys(%hash)
unshift(@array, $newValue)
scalar
(@array)
50. eq - ne - lt - le - gt - ge
Variable context
lcfirst($string)
size string comparison operators
access modes