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