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