Test your basic knowledge |

Perl Programming

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